subject:(Quantum communication)

University of Illinois – Urbana-Champaign

1. Graham, Trent Michael. Using hyperentanglement for advanced quantum communication.

Degree: PhD, Physics, 2016, University of Illinois – Urbana-Champaign

► The field of quantum information science promises incredible enhancements in computing, metrology, simulation, and communication, but the challenge of creating, manipulating, and measuring the large… (more)

▼ The field of quantum information science promises incredible enhancements in computing, metrology, simulation, and communication, but the challenge of creating, manipulating, and measuring the large quantum states has limited current implementations of such techniques. Such limitations affect photonic quantum information in particular, because photons lack the strong nonlinear interactions required for building up many-particle entangled states and performing multi-photon gates; nevertheless, because photons are currently the only "flying qubit", i.e., qubits that are mobile, they are a required resource for quantum communication protocols. One strategy to partially mitigate this limitation is to encode multiple entangled qubits on the different degrees of freedom of a single pair of photons. Such "hyperentangled" quantum states may be created with enough qubits to enable a whole new class of quantum information experiments. Furthermore, while nonlinear interactions are required to implement multi-qubit gates between qubits encoded on different particles, such gates can be implemented between qubits encoded on the same particle using only linear elements, enabling a much broader class of measurements. We use hyperentangled states to implement various quantum communication and quantum metrology protocols. Specifically, we demonstrate that hyperentangled photons can be used to increase the classical channel capacity of a quantum channel, transport quantum information between two remote parties efficiently and deterministically, and efficiently characterize quantum channels. We will discuss how to produce, manipulate, and measure hyperentangled states and discuss how entanglement in multiple degrees of freedom enables each technique. Finally, we discuss the limitations of each of these techniques and how they might be improved as technology advances. Advisors/Committee Members: Kwiat, Paul G. (advisor), Van Harlingen, Dale J. (Committee Chair), Ceperley, David M. (committee member), Peng, Jen-Chieh (committee member), Hughes, Taylor L. (committee member).

Subjects/Keywords: Hyperentanglement; Quantum Communication; Quantum Optics

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APA (6^th Edition):

Graham, T. M. (2016). Using hyperentanglement for advanced quantum communication. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/90539

Chicago Manual of Style (16^th Edition):

Graham, Trent Michael. “Using hyperentanglement for advanced quantum communication.” 2016. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed March 08, 2021. http://hdl.handle.net/2142/90539.

MLA Handbook (7^th Edition):

Graham, Trent Michael. “Using hyperentanglement for advanced quantum communication.” 2016. Web. 08 Mar 2021.

Vancouver:

Graham TM. Using hyperentanglement for advanced quantum communication. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2016. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/2142/90539.

Council of Science Editors:

Graham TM. Using hyperentanglement for advanced quantum communication. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/90539

University of Waterloo

2. Marwah, Ashutosh Satyajit. Optical Quantum Communication & Cryptography with Temporarily Trusted Parties.

Degree: 2019, University of Waterloo

URL: http://hdl.handle.net/10012/15087

► The work in this thesis can be divided into three parts. The first two parts deal with optical quantum communication protocols and the third part… (more)

▼ The work in this thesis can be divided into three parts. The first two parts deal with optical quantum communication protocols and the third part deals with quantum cryptography. The first part of the thesis is a step towards reformulating quantum protocols in terms of coherent states. Quantum communication protocols are typically formulated in terms of abstract qudit states and operations. This leaves the question of an experimental realization open. Direct translation of these protocols, say into single photons with some d-dimensional degree of freedom, are typically challenging to realize. Multi-mode coherent states, on the other hand, can be easily generated experimentally. Reformulation of protocols in terms of these states has been a successful strategy for implementation of quantum protocols. Quantum key distribution and the quantum fingerprinting protocol have both followed this route. In Chapter 3, we characterize the Gram matrices of multi-mode coherent states in an attempt to understand the class of communication protocols, which can be implemented using these states. We also derive the closure of the Gram matrices, which can be implemented in this way, so that we also characterize those matrices, which can be approximated arbitrarily well using multi-mode coherent states. In the second part of the thesis, Chapter 4, we describe our collaboration with an experimental group to implement the quantum fingerprinting protocol and examine the tradeoffs between the resources required to implement such protocols. It is seen that it is difficult to implement the quantum fingerprinting protocol experimentally for large input sizes. This leads us to study the tradeoff between the two resources expended during optically implemented simultaneous message passing communication protocols: the duration of the protocol and the energy required to run it. We derive general bounds on the growth of these quantities which are valid for all optical protocols. We also develop tighter bounds for the growth of these resources for protocols implementing quantum fingerprinting with coherent states. Finally in Chapter 5, we venture into quantum cryptography. We introduce a new setting for two-party cryptography with temporarily trusted third parties. In this setting, in addition to Alice and Bob, there are third parties, which Alice and Bob both trust to be honest during the course of the protocol. However, once the protocol concludes, there is no guarantee over the behaviour of these third parties. It is possible that they collaborate and act adversarially against the honest parties. We implement a variant of bit commitment in this setting, which we call erasable bit commitment. In this primitive, Alice has the choice of either opening or erasing her commitment after the commit phase. The ability to ask for an erasure allows Alice to ask the trusted nodes to erase her commitment in case the trust period is about to expire. However, this ability also makes erasable bit commitment weaker than the standard version of bit…

Subjects/Keywords: quantum communication; quantum optics; quantum cryptography

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Marwah, A. S. (2019). Optical Quantum Communication & Cryptography with Temporarily Trusted Parties. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/15087

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Marwah, Ashutosh Satyajit. “Optical Quantum Communication & Cryptography with Temporarily Trusted Parties.” 2019. Thesis, University of Waterloo. Accessed March 08, 2021. http://hdl.handle.net/10012/15087.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Marwah, Ashutosh Satyajit. “Optical Quantum Communication & Cryptography with Temporarily Trusted Parties.” 2019. Web. 08 Mar 2021.

Vancouver:

Marwah AS. Optical Quantum Communication & Cryptography with Temporarily Trusted Parties. [Internet] [Thesis]. University of Waterloo; 2019. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10012/15087.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Marwah AS. Optical Quantum Communication & Cryptography with Temporarily Trusted Parties. [Thesis]. University of Waterloo; 2019. Available from: http://hdl.handle.net/10012/15087

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

3. Meyer-Scott, Evan. Heralding Photonic Qubits for Quantum Communication.

Degree: 2016, University of Waterloo

URL: http://hdl.handle.net/10012/10201

► Quantum communication attempts to harness the unique rules of quantum mechanics to perform communication tasks that are difficult or impossible using classical rules. To realize… (more)

▼ Quantum communication attempts to harness the unique rules of quantum mechanics to perform communication tasks that are difficult or impossible using classical rules. To realize these benefits, information must be carried on quantum systems. Photons make excellent carriers because they interact very little with the environment, move quickly, and can naturally store quantum information in their polarization. However, it is notoriously difficult to detect a single photon without destroying it. Standard detectors simply absorb the photon, losing the quantum information. This is a critical outstanding problem in quantum communication, as advanced protocols need to know exactly when a photon has arrived at a receiver after transmission through the atmosphere or an optical fibre before performing further quantum-information-processing tasks. Certifying a photon’s presence is of particular interest in tests of Bell’s inequalities, which have only recently been performed without loopholes arising from photon loss, and in device-independent quantum cryptography, which relies on such Bell tests for security. In this thesis, I first present work on directly reducing losses in a successful loophole-free Bell test. This is an extremely difficult task that cannot be extended for long-distance communication. Therefore I then focus on ways to circumvent loss by detecting photons without destroying them while preserving their quantum information. First I analyze theoretically a way to herald photons using only linear-optical elements (beam splitters and phase shifters) and extra ancilla photons. Similar but older methods have been demonstrated experimentally by other groups, and my improvements will help future advanced quantum communication protocols. The main experiment in this thesis certifies the presence of a photon in a rather simple way: split the photon into two using a nonlinear optical crystal, then detect one of the pair to herald the other. I show in this first proof-of-principle experiment that photonic qubit precertification indeed preserves qubit states, with up to (92.3 ± 0.6)% fidelity and rates of 1100 events per hour. With reductions in detector dark counts, precertification could outperform direct transmission, even with extremely lossy fibre links. Finally, I present two sources of photons based on nonlinearities in optical fibres. One of the limitations of the photon splitting scheme for heralding is the low success probability due to the very low likelihood of splitting a photon in two. In these fibre photon sources I investigate increasing the splitting likelihood in four-wave mixing through advanced materials and fibre designs. I use polarization-maintaining fibres to generate entangled photon pairs as a prerequisite to precertification, with (92.2 ± 0.2)% fidelity to a maximally-entangled state. Then I show that one type of highly nonlinear chalcogenide glass, never before used for photon pair generation, could outperform standard nonlinear crystals by two orders of magnitude, with calculated…

Subjects/Keywords: quantum optics; quantum information; quantum communication; photonics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Meyer-Scott, E. (2016). Heralding Photonic Qubits for Quantum Communication. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/10201

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Meyer-Scott, Evan. “Heralding Photonic Qubits for Quantum Communication.” 2016. Thesis, University of Waterloo. Accessed March 08, 2021. http://hdl.handle.net/10012/10201.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Meyer-Scott, Evan. “Heralding Photonic Qubits for Quantum Communication.” 2016. Web. 08 Mar 2021.

Vancouver:

Meyer-Scott E. Heralding Photonic Qubits for Quantum Communication. [Internet] [Thesis]. University of Waterloo; 2016. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10012/10201.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Meyer-Scott E. Heralding Photonic Qubits for Quantum Communication. [Thesis]. University of Waterloo; 2016. Available from: http://hdl.handle.net/10012/10201

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

4. Shayeghi, Ala. Quantum Rejection Sampling.

Degree: 2015, University of Waterloo

URL: http://hdl.handle.net/10012/9114

► Let H be a finite dimensional Hilbert space and ρ, σ ∈ D(H) be quantum states in H such that S(ρ||σ) is finite. In this… (more)

▼ Let H be a finite dimensional Hilbert space and ρ, σ ∈ D(H) be quantum states in H such that S(ρ||σ) is finite. In this thesis, we consider the following communication task involving two parties Alice and Bob. Suppose that Alice is given a classical description of the states ρ and σ. Given an unlimited number of copies of an entangled state whose marginal on Bob’s side is σ, Alice’s goal is to help Bob output a single copy of the state ρ by sending a single message to Bob in a one-way LOCC (short for local operation and classical communication) protocol. We propose a class of one-way LOCC protocols for this task which we refer to as quantum rejection sampling protocols. Inspired by the classical rejection sampling protocol of Harsha, Jain, McAllester, and Radhakrishnan [25] for a similar classical communication task, we introduce the Greedy Quantum Rejection Sampler. We characterize the expected communication cost of the protocol in terms of max-relative entropy of ρ with respect to σ, in the case where the state ρ is a pure state and prove that the Greedy Quantum Rejection Sampler is an optimal quantum rejection sampling protocol in this case. We describe an optimal quantum rejection sampling protocol in terms of a semidefinite program and we find general lower bounds and upper bounds on the expected communication cost of the optimal protocol. We propose an LOCC compression protocol based on the Greedy Quantum Rejection Sampler protocol, for lossless compression of an arbitrary pure state quantum source in the visible compression model and we show an upper bound on the average length of this encoding. The upper bound is always less than or equal to the Shannon entropy of the quantum source and the gap between the two quantities can be arbitrary large. Finally, we introduce a high-entanglement deterministic exact protocol for remote preparation of an arbitrary ensemble of quantum states. Our protocol is based on a quantum rejection sampling protocol which uses a prefix-free encoding for communication of the messages. We establish an upper bound on the expected communication cost of this protocol for the worst case choice of the target state in terms of the max-information in Bob’s output register at the end of the protocol about Alice’s classical input register. Furthermore, this protocol can be used as a non-oblivious universal protocol for exact remote preparation of an arbitrary d-dimensional state at an expected communication cost of at most lg(d) +O (lg(lg(d))).

Subjects/Keywords: Quantum Communication Complexity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shayeghi, A. (2015). Quantum Rejection Sampling. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/9114

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shayeghi, Ala. “Quantum Rejection Sampling.” 2015. Thesis, University of Waterloo. Accessed March 08, 2021. http://hdl.handle.net/10012/9114.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shayeghi, Ala. “Quantum Rejection Sampling.” 2015. Web. 08 Mar 2021.

Vancouver:

Shayeghi A. Quantum Rejection Sampling. [Internet] [Thesis]. University of Waterloo; 2015. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10012/9114.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shayeghi A. Quantum Rejection Sampling. [Thesis]. University of Waterloo; 2015. Available from: http://hdl.handle.net/10012/9114

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

5. Killoran, Nathan. Entanglement quantification and quantum benchmarking of optical communication devices.

Degree: 2012, University of Waterloo

URL: http://hdl.handle.net/10012/6662

► In this thesis, we develop a number of operational tests and tools for benchmarking the quantum nature of optical quantum communication devices. Using the laws… (more)

Subjects/Keywords: quantum communication; quantum optics; quantum benchmarks; quantum information; entanglement

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Killoran, N. (2012). Entanglement quantification and quantum benchmarking of optical communication devices. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/6662

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Killoran, Nathan. “Entanglement quantification and quantum benchmarking of optical communication devices.” 2012. Thesis, University of Waterloo. Accessed March 08, 2021. http://hdl.handle.net/10012/6662.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Killoran, Nathan. “Entanglement quantification and quantum benchmarking of optical communication devices.” 2012. Web. 08 Mar 2021.

Vancouver:

Killoran N. Entanglement quantification and quantum benchmarking of optical communication devices. [Internet] [Thesis]. University of Waterloo; 2012. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10012/6662.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Killoran N. Entanglement quantification and quantum benchmarking of optical communication devices. [Thesis]. University of Waterloo; 2012. Available from: http://hdl.handle.net/10012/6662

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

6. Meyer-Scott, Evan. Experimental quantum communication in demanding regimes.

Degree: 2011, University of Waterloo

URL: http://hdl.handle.net/10012/6052

► Quantum communication promises to outperform its classical counterparts and enable protocols previously impossible. Specifically, quantum key distribution (QKD) allows a cryptographic key to be shared… (more)

Subjects/Keywords: quantum communication; quantum information; quantum key distribution; QKD; quantum cryptography

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Meyer-Scott, E. (2011). Experimental quantum communication in demanding regimes. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/6052

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Meyer-Scott, Evan. “Experimental quantum communication in demanding regimes.” 2011. Thesis, University of Waterloo. Accessed March 08, 2021. http://hdl.handle.net/10012/6052.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Meyer-Scott, Evan. “Experimental quantum communication in demanding regimes.” 2011. Web. 08 Mar 2021.

Vancouver:

Meyer-Scott E. Experimental quantum communication in demanding regimes. [Internet] [Thesis]. University of Waterloo; 2011. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10012/6052.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Meyer-Scott E. Experimental quantum communication in demanding regimes. [Thesis]. University of Waterloo; 2011. Available from: http://hdl.handle.net/10012/6052

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

7. Arrazola, Juan Miguel. Practical Quantum Communication.

Degree: 2015, University of Waterloo

URL: http://hdl.handle.net/10012/9850

► Current communication networks are based on classical physics and classical information-processing. However, for nearly a century, we have known that at its most fundamental level,… (more)

Subjects/Keywords: quantum communication; quantum cryptography; communication complexity; entanglement verification; quantum optics

11 more images…

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APA (6^th Edition):

Arrazola, J. M. (2015). Practical Quantum Communication. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/9850

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Arrazola, Juan Miguel. “Practical Quantum Communication.” 2015. Thesis, University of Waterloo. Accessed March 08, 2021. http://hdl.handle.net/10012/9850.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Arrazola, Juan Miguel. “Practical Quantum Communication.” 2015. Web. 08 Mar 2021.

Vancouver:

Arrazola JM. Practical Quantum Communication. [Internet] [Thesis]. University of Waterloo; 2015. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10012/9850.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Arrazola JM. Practical Quantum Communication. [Thesis]. University of Waterloo; 2015. Available from: http://hdl.handle.net/10012/9850

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

8. Hill, Alexander D. Spatial mode control and advanced methods for multi-platform quantum communication.

Degree: PhD, Physics, 2018, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/102394

► Though state-of-the-art quantum computers are currently limited to only a handful of physical qubits, a quantum computer large enough to perform prime factorization of modern… (more)

Subjects/Keywords: Quantum Communication; Quantum Optics; Adaptive Optics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hill, A. D. (2018). Spatial mode control and advanced methods for multi-platform quantum communication. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/102394

Chicago Manual of Style (16^th Edition):

Hill, Alexander D. “Spatial mode control and advanced methods for multi-platform quantum communication.” 2018. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed March 08, 2021. http://hdl.handle.net/2142/102394.

MLA Handbook (7^th Edition):

Hill, Alexander D. “Spatial mode control and advanced methods for multi-platform quantum communication.” 2018. Web. 08 Mar 2021.

Vancouver:

Hill AD. Spatial mode control and advanced methods for multi-platform quantum communication. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2018. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/2142/102394.

Council of Science Editors:

Hill AD. Spatial mode control and advanced methods for multi-platform quantum communication. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/102394

University of Technology, Sydney

9. Wang, Xin. Semidefinite optimization for quantum information.

Degree: 2018, University of Technology, Sydney

URL: http://hdl.handle.net/10453/127996

► This thesis aims to improve our understanding of the structure of quantum entanglement and the limits of information processing with quantum systems. It presents new… (more)

▼ This thesis aims to improve our understanding of the structure of quantum entanglement and the limits of information processing with quantum systems. It presents new results relevant to three threads of quantum information: the theory of quantum entanglement, the communication capabilities of quantum channels, and the quantum zero-error information theory. In the first part, we investigate the fundamental features of quantum entanglement and develop quantitative approaches to better exploit the power of entanglement. First, we introduce a computable and additive entanglement measure to quantify the amount of entanglement, which also plays an important role as the improved semidefinite programming (SDP) upper bound of distillable entanglement. Second, we show that the Rains bound is neither additive nor equal to the asymptotic relative entropy of entanglement. Third, we establish SDP lower bounds for the entanglement cost and demonstrate the irreversibility of asymptotic entanglement manipulation under positive-partial-transpose-preserving quantum operations, resolving a major open problem in quantum information theory. In the second part, we develop a framework of semidefinite programs to evaluate the classical and quantum communication capabilities of quantum channels in both the non-asymptotic and asymptotic regimes. In particular, we establish the first general SDP strong converse bound on the classical capacity of an arbitrary quantum channel and give in particular the best known upper bound on the classical capacity of the amplitude damping channel. We further establish a finite resource analysis of classical communication over quantum erasure channels, including the first second-order expansion of classical capacity beyond entanglement-breaking channels. For quantum communication, we establish the best SDP-computable strong converse bound and refine it as the so-called max-Rains information. In the third part, we investigate the quantum zero-error information theory. In contrast to the conventional Shannon theory, there is a very different-looking information theory when errors are required to be precisely zero, where the communication problem reduces to the analysis of the so-called confusability graph (noncommutative graph) of a classical channel (quantum channel). We develop an activated communication model and explore its novel properties. Notably, we separate the quantum Lovász number and the entanglement-assisted zero-error capacity, resolving an intriguing open problem in the area of zero-error information.

Subjects/Keywords: Semi-definite optimization.; Quantum communication channel.; Quantum zero-error.; Quantum entanglement.; Quantum communication.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wang, X. (2018). Semidefinite optimization for quantum information. (Thesis). University of Technology, Sydney. Retrieved from http://hdl.handle.net/10453/127996

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wang, Xin. “Semidefinite optimization for quantum information.” 2018. Thesis, University of Technology, Sydney. Accessed March 08, 2021. http://hdl.handle.net/10453/127996.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wang, Xin. “Semidefinite optimization for quantum information.” 2018. Web. 08 Mar 2021.

Vancouver:

Wang X. Semidefinite optimization for quantum information. [Internet] [Thesis]. University of Technology, Sydney; 2018. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10453/127996.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang X. Semidefinite optimization for quantum information. [Thesis]. University of Technology, Sydney; 2018. Available from: http://hdl.handle.net/10453/127996

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Australian National University

10. Li, Yi. Design of Quantum Repeaters .

Degree: 2017, Australian National University

URL: http://hdl.handle.net/1885/141335

► Quantum communication holds the promise of achieving long-distance secure message transmission by exploiting quantum entanglement between remote locations. Quantum repeaters are indispensable to the realization… (more)

Subjects/Keywords: quantum communication; quantum information; quantum repeater; quantum key distribution; quantum amplification; channel equalisation

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APA (6^th Edition):

Li, Y. (2017). Design of Quantum Repeaters . (Thesis). Australian National University. Retrieved from http://hdl.handle.net/1885/141335

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Li, Yi. “Design of Quantum Repeaters .” 2017. Thesis, Australian National University. Accessed March 08, 2021. http://hdl.handle.net/1885/141335.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Li, Yi. “Design of Quantum Repeaters .” 2017. Web. 08 Mar 2021.

Vancouver:

Li Y. Design of Quantum Repeaters . [Internet] [Thesis]. Australian National University; 2017. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1885/141335.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Li Y. Design of Quantum Repeaters . [Thesis]. Australian National University; 2017. Available from: http://hdl.handle.net/1885/141335

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Cambridge

11. Guha Majumdar, Mrittunjoy. Quantum information processing using the power-of-SWAP.

Degree: PhD, 2019, University of Cambridge

URL: https://doi.org/10.17863/CAM.35324 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763867

► This project is a comprehensive investigation into the application of the exchange interaction, particularly with the realization of the SWAP¹/n quantum operator, in quantum information… (more)

▼ This project is a comprehensive investigation into the application of the exchange interaction, particularly with the realization of the SWAP¹/n quantum operator, in quantum information processing. We study the generation, characterization and application of entanglement in such systems. Given the non-commutativity of neighbouring SWAP¹/n gates, the mathematical study of combinations of these gates is an interesting avenue of research that we have explored, though due to the exponential scaling of the complexity of the problem with the number of qubits in the system, numerical techniques, though good for few-qubit systems, are found to be inefficient for this research problem when we look at systems with higher number of qubits. Since the group of SWAP¹/n operators is found to be isomorphic to the symmetric group Sn, we employ group-theoretic methods to find the relevant invariant subspaces and associated vector-states. Some interesting patterns of states are found including onedimensional invariant subspaces spanned by W-states and the Hamming-weight preserving symmetry of the vectors spanning the various invariant subspaces. We also devise new ways of characterizing entanglement and approach the separability problem by looking at permutation symmetries of subsystems of quantum states. This idea is found to form a bridge with the entanglement characterization tool of Peres-Horodecki's Partial Positive Transpose (PPT), for mixed quantum states. We also look at quantum information taskoriented 'distance' measures of entanglement, besides devising a new entanglement witness in the 'engle'. In terms of applications, we define five different formalisms for quantum computing: the circuit-based model, the encoded qubit model, the cluster-state model, functional quantum computation and the qudit-based model. Later in the thesis, we explore the idea of quantum computing based on decoherence-free subspaces. We also investigate ways of applying the SWAP¹/n in entanglement swapping for quantum repeaters, quantum communication protocols and quantum memory.

Subjects/Keywords: 006.3; Quantum Entanglement; Quantum Information Processing; Quantum Communication; Quantum Memory; Quantum Computation; Decoherence-free Subspaces

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Guha Majumdar, M. (2019). Quantum information processing using the power-of-SWAP. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.35324 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763867

Chicago Manual of Style (16^th Edition):

Guha Majumdar, Mrittunjoy. “Quantum information processing using the power-of-SWAP.” 2019. Doctoral Dissertation, University of Cambridge. Accessed March 08, 2021. https://doi.org/10.17863/CAM.35324 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763867.

MLA Handbook (7^th Edition):

Guha Majumdar, Mrittunjoy. “Quantum information processing using the power-of-SWAP.” 2019. Web. 08 Mar 2021.

Vancouver:

Guha Majumdar M. Quantum information processing using the power-of-SWAP. [Internet] [Doctoral dissertation]. University of Cambridge; 2019. [cited 2021 Mar 08]. Available from: https://doi.org/10.17863/CAM.35324 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763867.

Council of Science Editors:

Guha Majumdar M. Quantum information processing using the power-of-SWAP. [Doctoral Dissertation]. University of Cambridge; 2019. Available from: https://doi.org/10.17863/CAM.35324 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763867

12. sajeed, shihan. Security Evaluation of Practical Quantum Communication Systems.

Degree: 2017, University of Waterloo

URL: http://hdl.handle.net/10012/12519

► Modern information and communication technology (ICT), including internet, smart phones, cloud computing, global positioning system, e-commerce, e-Health, global communications and internet of things (IoT), all… (more)

▼ Modern information and communication technology (ICT), including internet, smart phones, cloud computing, global positioning system, e-commerce, e-Health, global communications and internet of things (IoT), all rely fundamentally - for identification, authentication, confidentiality and confidence - on cryptography. However, there is a high chance that most modern cryptography protocols will be annihilated upon the arrival of quantum computers. This necessitates taking steps for making the current ICT systems secure against quantum computers. The task is a huge and time-consuming task and there is a serious probability that quantum computers will arrive before it is complete. Hence, it is of utmost importance to understand the risk and start planning for the solution now. At this moment, there are two potential paths that lead to solution. One is the path of post-quantum cryptography: inventing classical cryptographic algorithms that are secure against quantum attacks. Although they are hoped to provide security against quantum attacks for most situations in practice, there is no mathematical proof to guarantee unconditional security (`unconditional security' is a technical term that means security is not dependent on a computational hardness assumption). This has driven many to choose the second path: quantum cryptography (QC). Quantum cryptography - utilizing the power of quantum mechanics - can guarantee unconditional security in theory. However, in practice, device behavior varies from the modeled behavior, leading to side-channels that can be exploited by an adversary to compromise security. Thus, practical QC systems need to be security evaluated - i.e., scrutinized and tested for possible vulnerabilities - before they are sold to customers or deployed in large scale. Unfortunately, this task has become more and more demanding as QC systems are being built in various style, variants and forms at different parts of the globe. Hence, standardization and certification of security evaluation methods are necessary. Also, a number of compatibility, connectivity and interoperability issues among the QC systems require standardization and certification which makes it an issue of highest priority. In this thesis, several areas of practical quantum communication systems were scrutinized and tested for the purpose of standardization and certification. At the source side, the calibration mechanism of the outgoing mean photon number - a critical parameter for security - was investigated. As a prototype, the pulse-energy-monitoring system (PEMS) implemented in a commercial quantum key distribution (QKD) machine was chosen and the design validity was tested. It was found that the security of PEMS was based on flawed design logic and conservative assumptions on Eve's ability. Our results pointed out the limitations of closed security standards developed inside a company and highlighted the need for developing - for security - open standards and testing methodologies in collaboration between research and industry. …

Subjects/Keywords: quantum cryptography; quantum hacking; security evaluation of quantum cryptography; quantum communication; quantum attacks; implementation security; loopholes in quantum cryptography

11 more images…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

sajeed, s. (2017). Security Evaluation of Practical Quantum Communication Systems. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/12519

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

sajeed, shihan. “Security Evaluation of Practical Quantum Communication Systems.” 2017. Thesis, University of Waterloo. Accessed March 08, 2021. http://hdl.handle.net/10012/12519.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

sajeed, shihan. “Security Evaluation of Practical Quantum Communication Systems.” 2017. Web. 08 Mar 2021.

Vancouver:

sajeed s. Security Evaluation of Practical Quantum Communication Systems. [Internet] [Thesis]. University of Waterloo; 2017. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10012/12519.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

sajeed s. Security Evaluation of Practical Quantum Communication Systems. [Thesis]. University of Waterloo; 2017. Available from: http://hdl.handle.net/10012/12519

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Bristol

13. Llewellyn, Dan M. Quantum information processing by programming optical nano-circuits in silicon.

Degree: PhD, 2020, University of Bristol

URL: http://hdl.handle.net/1983/a0759ead-c105-408a-a0ca-5a3caedaf328

► Quantum technologies, able to manipulate the individual quantum states of single particles, have the potential to revolutionise science and engineering. The possible applications of these… (more)

Subjects/Keywords: quantum communication; quantum computing; quantum information; Quantum Photonics; quantum key distribution; quantum optics; silicon photonics; photonics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Llewellyn, D. M. (2020). Quantum information processing by programming optical nano-circuits in silicon. (Doctoral Dissertation). University of Bristol. Retrieved from http://hdl.handle.net/1983/a0759ead-c105-408a-a0ca-5a3caedaf328

Chicago Manual of Style (16^th Edition):

Llewellyn, Dan M. “Quantum information processing by programming optical nano-circuits in silicon.” 2020. Doctoral Dissertation, University of Bristol. Accessed March 08, 2021. http://hdl.handle.net/1983/a0759ead-c105-408a-a0ca-5a3caedaf328.

MLA Handbook (7^th Edition):

Llewellyn, Dan M. “Quantum information processing by programming optical nano-circuits in silicon.” 2020. Web. 08 Mar 2021.

Vancouver:

Llewellyn DM. Quantum information processing by programming optical nano-circuits in silicon. [Internet] [Doctoral dissertation]. University of Bristol; 2020. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1983/a0759ead-c105-408a-a0ca-5a3caedaf328.

Council of Science Editors:

Llewellyn DM. Quantum information processing by programming optical nano-circuits in silicon. [Doctoral Dissertation]. University of Bristol; 2020. Available from: http://hdl.handle.net/1983/a0759ead-c105-408a-a0ca-5a3caedaf328

University of Waterloo

14. Shayeghi, Ala. Noisy Interactive Quantum Communication.

Degree: 2020, University of Waterloo

URL: http://hdl.handle.net/10012/16161

► We consider the problem of implementing two-party interactive quantum communication over noisy channels, a necessary endeavor if we wish to fully reap quantum advantages for… (more)

Subjects/Keywords: quantum communication complexity; coding theory; interactive communication; quantum channel capacity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shayeghi, A. (2020). Noisy Interactive Quantum Communication. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/16161

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shayeghi, Ala. “Noisy Interactive Quantum Communication.” 2020. Thesis, University of Waterloo. Accessed March 08, 2021. http://hdl.handle.net/10012/16161.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shayeghi, Ala. “Noisy Interactive Quantum Communication.” 2020. Web. 08 Mar 2021.

Vancouver:

Shayeghi A. Noisy Interactive Quantum Communication. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10012/16161.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shayeghi A. Noisy Interactive Quantum Communication. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/16161

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Bristol

15. Semenenko, Henry. Advances in chip-based quantum key distribution.

Degree: PhD, 2020, University of Bristol

URL: http://hdl.handle.net/1983/f5cad379-9b65-4f34-929c-7f419d2d6074

► Technology founded in quantum phenomena is set to revolutionise computation, sensing and communication. With an entirely different method of manipulating information, quantum computers in particular… (more)

▼ Technology founded in quantum phenomena is set to revolutionise computation, sensing and communication. With an entirely different method of manipulating information, quantum computers in particular are able to offer significant advances when compared to their classical counterparts. Unrelenting research throughout the world implies that such machines are set to be the demise of public-key cryptography that is critical to modern society. Quantum key distribution (QKD) offers a method to securely distribute randomness between distant parties using the fundamental nature of the universe. Protocols do not depend on assumed hard problems and so the security of the key does not decrease as computing power increases. However, QKD systems have been susceptible to information leakage or hacks which compromises their security at the time of key exchange. As research demonstrations evolve into commercial systems, the security of a physical implementations must be addressed. Device-independent protocols have since been introduced to relieve the possibility of secret information falling into the hands of an adversary. Using correlations between random events, the physical system does not contain any information about the key. Therefore, it is not susceptible to attacks or able to reveal the secret key. This simplifies the task of characterising a system to guarantee a secure key exchange. Before QKD can be widely adopted, a cost-effective and scalable platform must be developed. In the last decade, photonic integration has been refined to facilitate circuit complexity simply not possible with bulk alternatives. The inherent robustness and phase-stability make it an excellent candidate for future quantum-secured networks. This thesis will explore how integrated photonics can be deployed in device-independent QKD protocols to both ensure practical security and enhance network accessibility. We will show how integrated components can be used to generate quantum states with high fidelity and demonstrate quantum interference. The complexity of photonic integration will be explored to demonstrate new circuits for QKD that will eventually form the backbone of quantum-secured networks.

Subjects/Keywords: quantum communication; quantum photonics; integrated optics; quantum key distribution; measurement device independent; quantum information; QKD

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Semenenko, H. (2020). Advances in chip-based quantum key distribution. (Doctoral Dissertation). University of Bristol. Retrieved from http://hdl.handle.net/1983/f5cad379-9b65-4f34-929c-7f419d2d6074

Chicago Manual of Style (16^th Edition):

Semenenko, Henry. “Advances in chip-based quantum key distribution.” 2020. Doctoral Dissertation, University of Bristol. Accessed March 08, 2021. http://hdl.handle.net/1983/f5cad379-9b65-4f34-929c-7f419d2d6074.

MLA Handbook (7^th Edition):

Semenenko, Henry. “Advances in chip-based quantum key distribution.” 2020. Web. 08 Mar 2021.

Vancouver:

Semenenko H. Advances in chip-based quantum key distribution. [Internet] [Doctoral dissertation]. University of Bristol; 2020. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1983/f5cad379-9b65-4f34-929c-7f419d2d6074.

Council of Science Editors:

Semenenko H. Advances in chip-based quantum key distribution. [Doctoral Dissertation]. University of Bristol; 2020. Available from: http://hdl.handle.net/1983/f5cad379-9b65-4f34-929c-7f419d2d6074

University of Toronto

16. Wang, Wenyuan. Adaptive Techniques in Practical Quantum Key Distribution.

Degree: PhD, 2020, University of Toronto

URL: http://hdl.handle.net/1807/101163

► Quantum Key Distribution (QKD) can provide information-theoretically secure communications and is a strong candidate for the next generation of cryptography. However, in practice, the performance… (more)

Subjects/Keywords: Free-space QKD; Machine Learning; Quantum Communication; Quantum Cryptography; Quantum Key Distribution; Quantum Network; 0599

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wang, W. (2020). Adaptive Techniques in Practical Quantum Key Distribution. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/101163

Chicago Manual of Style (16^th Edition):

Wang, Wenyuan. “Adaptive Techniques in Practical Quantum Key Distribution.” 2020. Doctoral Dissertation, University of Toronto. Accessed March 08, 2021. http://hdl.handle.net/1807/101163.

MLA Handbook (7^th Edition):

Wang, Wenyuan. “Adaptive Techniques in Practical Quantum Key Distribution.” 2020. Web. 08 Mar 2021.

Vancouver:

Wang W. Adaptive Techniques in Practical Quantum Key Distribution. [Internet] [Doctoral dissertation]. University of Toronto; 2020. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1807/101163.

Council of Science Editors:

Wang W. Adaptive Techniques in Practical Quantum Key Distribution. [Doctoral Dissertation]. University of Toronto; 2020. Available from: http://hdl.handle.net/1807/101163

University of Bristol

17. Semenenko, Henry. Advances in chip-based quantum key distribution.

Degree: PhD, 2020, University of Bristol

URL: https://research-information.bris.ac.uk/en/studentTheses/f5cad379-9b65-4f34-929c-7f419d2d6074 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.805616

► Technology founded in quantum phenomena is set to revolutionise computation, sensing and communication. With an entirely different method of manipulating information, quantum computers in particular… (more)

▼ Technology founded in quantum phenomena is set to revolutionise computation, sensing and communication. With an entirely different method of manipulating information, quantum computers in particular are able to offer significant advances when compared to their classical counterparts. Unrelenting research throughout the world implies that such machines are set to be the demise of public-key cryptography that is critical to modern society. Quantum key distribution (QKD) offers a method to securely distribute randomness between distant parties using the fundamental nature of the universe. Protocols do not depend on assumed hard problems and so the security of the key does not decrease as computing power increases. However, QKD systems have been susceptible to information leakage or hacks which compromises their security at the time of key exchange. As research demonstrations evolve into commercial systems, the security of a physical implementations must be addressed. Device-independent protocols have since been introduced to relieve the possibility of secret information falling into the hands of an adversary. Using correlations between random events, the physical system does not contain any information about the key. Therefore, it is not susceptible to attacks or able to reveal the secret key. This simplifies the task of characterising a system to guarantee a secure key exchange. Before QKD can be widely adopted, a cost-effective and scalable platform must be developed. In the last decade, photonic integration has been refined to facilitate circuit complexity simply not possible with bulk alternatives. The inherent robustness and phase-stability make it an excellent candidate for future quantum-secured networks. This thesis will explore how integrated photonics can be deployed in device-independent QKD protocols to both ensure practical security and enhance network accessibility. We will show how integrated components can be used to generate quantum states with high fidelity and demonstrate quantum interference. The complexity of photonic integration will be explored to demonstrate new circuits for QKD that will eventually form the backbone of quantum-secured networks.

Subjects/Keywords: quantum communication; quantum photonics; integrated optics; quantum key distribution; measurement device independent; quantum information; QKD

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Semenenko, H. (2020). Advances in chip-based quantum key distribution. (Doctoral Dissertation). University of Bristol. Retrieved from https://research-information.bris.ac.uk/en/studentTheses/f5cad379-9b65-4f34-929c-7f419d2d6074 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.805616

Chicago Manual of Style (16^th Edition):

Semenenko, Henry. “Advances in chip-based quantum key distribution.” 2020. Doctoral Dissertation, University of Bristol. Accessed March 08, 2021. https://research-information.bris.ac.uk/en/studentTheses/f5cad379-9b65-4f34-929c-7f419d2d6074 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.805616.

MLA Handbook (7^th Edition):

Semenenko, Henry. “Advances in chip-based quantum key distribution.” 2020. Web. 08 Mar 2021.

Vancouver:

Semenenko H. Advances in chip-based quantum key distribution. [Internet] [Doctoral dissertation]. University of Bristol; 2020. [cited 2021 Mar 08]. Available from: https://research-information.bris.ac.uk/en/studentTheses/f5cad379-9b65-4f34-929c-7f419d2d6074 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.805616.

Council of Science Editors:

Semenenko H. Advances in chip-based quantum key distribution. [Doctoral Dissertation]. University of Bristol; 2020. Available from: https://research-information.bris.ac.uk/en/studentTheses/f5cad379-9b65-4f34-929c-7f419d2d6074 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.805616

18. Olislager, Laurent. Manipulating frequency-entangled photons : Manipulation de photons intriqués en fréquence.

Degree: Docteur es, Optique et photonique, 2014, Besançon; Université libre de Bruxelles (1970-....)

URL: http://www.theses.fr/2014BESA2079

►

Les pères fondateurs de la mécanique quantique exploraient les implications de leur théorie avec des "expériences de pensée". Les améliorations continuelles en matière de manipulation… (more)

▼

Les pères fondateurs de la mécanique quantique exploraient les implications de leur théorie avec des "expériences de pensée". Les améliorations continuelles en matière de manipulation de systèmes quantiques individuels ont ouvert la voie à des recherches théoriques et expérimentales. C'est la base de l'information quantique: quand un contenu informationnel est associé à des transformations et mesures sur des systèmes quantiques, cela offre un nouveau paradigme à la théorie de l'information. Une des promesses de l'information quantique est la réalisation d'un internet quantique: des liaisons quantiques permettraient de partager des états quantiques entre les noeuds du réseau. Le contexte de notre travail est l'optique quantique expérimentale dans des fibres optiques aux longueurs d'onde des télécommunications, avec comme perspective des applications en communication quantique. Nous démontrons une nouvelle méthode pour manipuler des photons intriqués en énergie-temps, en utilisant des composants fibrés et optoélectroniques standard. Les photons produits par paires par une source de conversion paramétrique sont envoyés dans des modulateurs de phase électro-optiques indépendants, qui agissent comme des diviseurs de faisceau en fréquence. Nous utilisons ensuite des filtres fréquentiels et des détecteurs de photons uniques pour discriminer les fréquences des photons. Nos résultats expérimentaux incluent l'obtention d'interférences à deux photons robustes, à haute visibilité et à haute dimension, qui permettent la violation d'inégalités de Bell. Cela montre qu'une telle "intrication en bins fréquentiels" est une plate-forme intéressante pour la communication Quantique.

The founding fathers of quantum mechanics explored the implications of their theory with "gedanken experiments". Continuous improvement of the experimental manipulation of individual quantum systems has opened the way to exciting research, both on blackboards and in laboratories. lt is the basis for quantum information processing : when an information content is associated with transformations and measurements of quantum systems, it offers a new paradigm, full of potentialities, to information theory. One of the promises of quantum information is the realization of a quantum internet: quantum communication links would allow to share quantum states between the nodes of the network.Our work lies in the context of experimental quantum optics in optical fibers at telecommunication wavelengths, in view of quantum communication applications. We demonstrate a new method for manipulating photons entangled in their energy-time degree of freedom, by using standard fiber-optic and optoelectronic components. The photon pairs produced by a parametric down-conversion source are sent through independent electrooptic phase modulators, which act as high-dimensional frequency beam splitters. We then use frequency filters and single-photon detectors to discriminate the frequencies of the photons. Our experimental results include robust, high-visibility and high-dimensional…

Advisors/Committee Members: Merolla, Jean-Marc (thesis director), Emplit, Phillippe (thesis director).

Subjects/Keywords: Intrication quantique; Communication quantique; Optique quantique; Quantum entanglement; Quantum communication; Quantum optics; 621.36

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Olislager, L. (2014). Manipulating frequency-entangled photons : Manipulation de photons intriqués en fréquence. (Doctoral Dissertation). Besançon; Université libre de Bruxelles (1970-....). Retrieved from http://www.theses.fr/2014BESA2079

Chicago Manual of Style (16^th Edition):

Olislager, Laurent. “Manipulating frequency-entangled photons : Manipulation de photons intriqués en fréquence.” 2014. Doctoral Dissertation, Besançon; Université libre de Bruxelles (1970-....). Accessed March 08, 2021. http://www.theses.fr/2014BESA2079.

MLA Handbook (7^th Edition):

Olislager, Laurent. “Manipulating frequency-entangled photons : Manipulation de photons intriqués en fréquence.” 2014. Web. 08 Mar 2021.

Vancouver:

Olislager L. Manipulating frequency-entangled photons : Manipulation de photons intriqués en fréquence. [Internet] [Doctoral dissertation]. Besançon; Université libre de Bruxelles (1970-....); 2014. [cited 2021 Mar 08]. Available from: http://www.theses.fr/2014BESA2079.

Council of Science Editors:

Olislager L. Manipulating frequency-entangled photons : Manipulation de photons intriqués en fréquence. [Doctoral Dissertation]. Besançon; Université libre de Bruxelles (1970-....); 2014. Available from: http://www.theses.fr/2014BESA2079

University of California – Riverside

19. Mlinar, Eric. Measurement and Quantum State Transfer in Superconducting Qubits.

Degree: Electrical Engineering, 2016, University of California – Riverside

URL: http://www.escholarship.org/uc/item/2dt5g764

► The potential of superconducting qubits as the medium for a scalable quantum computer has motivated the pursuit of improved interactions within this system. Two challenges… (more)

▼ The potential of superconducting qubits as the medium for a scalable quantum computer has motivated the pursuit of improved interactions within this system. Two challenges for the field of superconducting qubits are measurement fidelity, to accurately determine the state of the qubit, and the efficient transfer of quantum states. In measurement, the current state-of-the-art method employs dispersive readout, by coupling the qubit to a cavity and reading the resulting shift in cavity frequency to infer the qubit's state; however, this is vulnerable to Purcell relaxation, as well as being modeled off a simplified two-level abstraction of the qubit. In state transfer, the existing proposal for moving quantum states is mostly untested against non-idealities that will likely be present in an experiment. In this dissertation, we examine three problems within these two areas.We first describe a new scheme for fast and high-fidelity dispersive measurement specifically designed to circumvent the Purcell Effect. To do this, the qubit-resonator interaction is turned on only when the resonator is decoupled from the environment; then, after the resonator state has shifted enough to infer the qubit state, the qubit-resonator interaction is turned off before the resonator and environment are recoupled. We also show that the effectiveness of this ``Catch-Disperse-Release'' procedure partly originates from quadrature squeezing of the resonator state induced by the Jaynes-Cummings nonlinearity.The Catch-Disperse-Release measurement scheme treats the qubit as a two-level system, which is a common simplification used in theoretical works. However, the most promising physical candidate for a superconducting qubit, the transmon, is a multi-level system. In the second work, we examine the effects of including the higher energy levels of the transmon. Specifically, we expand the eigenstate picture developed in the first work to encompass multiple qubit levels, and examine the resulting changes to the system. In particular, we analyze the population of the non-target eigenstates as a result of this expanded model, and provide an analytical form for these deviations from the simpler model in Catch-Disperse-Release (i.e., the dressed state approximation).Lastly, we assess the robustness of the existing quantum state transfer protocol, testing its performance under typical experimental deviations from the ideal case. We show that the procedure is resilient to almost all non-idealities, except frequency mismatch between the two cavities. We also demonstrate a method to compensate for one such error in frequency-matching.

Subjects/Keywords: Electrical engineering; Quantum physics; Circuit Quantum Electrodynamics; Josephson devices; Quantum communication; Quantum computation architectures and implementations; Quantum State Transfer; Qubit Measurement

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mlinar, E. (2016). Measurement and Quantum State Transfer in Superconducting Qubits. (Thesis). University of California – Riverside. Retrieved from http://www.escholarship.org/uc/item/2dt5g764

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mlinar, Eric. “Measurement and Quantum State Transfer in Superconducting Qubits.” 2016. Thesis, University of California – Riverside. Accessed March 08, 2021. http://www.escholarship.org/uc/item/2dt5g764.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mlinar, Eric. “Measurement and Quantum State Transfer in Superconducting Qubits.” 2016. Web. 08 Mar 2021.

Vancouver:

Mlinar E. Measurement and Quantum State Transfer in Superconducting Qubits. [Internet] [Thesis]. University of California – Riverside; 2016. [cited 2021 Mar 08]. Available from: http://www.escholarship.org/uc/item/2dt5g764.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mlinar E. Measurement and Quantum State Transfer in Superconducting Qubits. [Thesis]. University of California – Riverside; 2016. Available from: http://www.escholarship.org/uc/item/2dt5g764

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Australian National University

20. Haw, Jing Yan. Continuous Variable Optimisation of Quantum Randomness and Probabilistic Linear Amplification .

Degree: 2018, Australian National University

URL: http://hdl.handle.net/1885/143588

► In the past decade, quantum communication protocols based on continuous variables (CV) has seen considerable development in both theoretical and experimental aspects. Nonetheless, challenges remain… (more)

▼ In the past decade, quantum communication protocols based on continuous variables (CV) has seen considerable development in both theoretical and experimental aspects. Nonetheless, challenges remain in both the practical security and the operating range for CV systems, before such systems may be used extensively. In this thesis, we present the optimisation of experimental parameters for secure randomness generation and propose a non-deterministic approach to enhance amplification of CV quantum state. The first part of this thesis examines the security of quantum devices: in particular, we investigate quantum random number generators (QRNG) and quantum key distribution (QKD) schemes. In a realistic scenario, the output of a quantum random number generator is inevitably tainted by classical technical noise, which potentially compromises the security of such a device. To safeguard against this, we propose and experimentally demonstrate an approach that produces side-information independent randomness. We present a method for maximising such randomness contained in a number sequence generated from a given quantum-to-classical-noise ratio. The detected photocurrent in our experiment is shown to have a real-time random-number generation rate of 14 (Mbit/s)/MHz. Next, we study the one-sided device-independent (1sDI) quantum key distribution scheme in the context of continuous variables. By exploiting recently proven entropic uncertainty relations, one may bound the information leaked to an eavesdropper. We use such a bound to further derive the secret key rate, that depends only upon the conditional Shannon entropies accessible to Alice and Bob, the two honest communicating parties. We identify and experimentally demonstrate such a protocol, using only coherent states as the resource. We measure the correlations necessary for 1sDI key distribution up to an applied loss equivalent to 3.5 km of fibre transmission. The second part of this thesis concerns the improvement in the transmission of a quantum state. We study two approximate implementations of a probabilistic noiseless linear amplifier (NLA): a physical implementation that truncates the working space of the NLA or a measurement-based implementation that realises the truncation by a bounded postselection filter. We do this by conducting a full analysis on the measurement-based NLA (MB-NLA), making explicit the relationship between its various operating parameters, such as amplification gain and the cut-off of operating domain. We compare it with its physical counterpart in terms of the Husimi Q-distribution and their probability of success. We took our investigations further by combining a probabilistic NLA with an ideal deterministic linear amplifier (DLA). In particular, we show that when NLA gain is…

Subjects/Keywords: Continuous variable quantum information processing; quantum communication; quantum key distribution; quantum random number generator; noiseless amplification; quantum cloning

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APA (6^th Edition):

Haw, J. Y. (2018). Continuous Variable Optimisation of Quantum Randomness and Probabilistic Linear Amplification . (Thesis). Australian National University. Retrieved from http://hdl.handle.net/1885/143588

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Haw, Jing Yan. “Continuous Variable Optimisation of Quantum Randomness and Probabilistic Linear Amplification .” 2018. Thesis, Australian National University. Accessed March 08, 2021. http://hdl.handle.net/1885/143588.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Haw, Jing Yan. “Continuous Variable Optimisation of Quantum Randomness and Probabilistic Linear Amplification .” 2018. Web. 08 Mar 2021.

Vancouver:

Haw JY. Continuous Variable Optimisation of Quantum Randomness and Probabilistic Linear Amplification . [Internet] [Thesis]. Australian National University; 2018. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1885/143588.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Haw JY. Continuous Variable Optimisation of Quantum Randomness and Probabilistic Linear Amplification . [Thesis]. Australian National University; 2018. Available from: http://hdl.handle.net/1885/143588

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

21. Huthmacher, Lukas. Investigation of efficient spin-photon interfaces for the realisation of quantum networks.

Degree: PhD, 2018, University of Cambridge

URL: https://doi.org/10.17863/CAM.24440 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744945

► Quantum networks lie at the heart of distributed quantum computing and secure quantum communication - research areas that have seen a strong increase of interest… (more)

▼ Quantum networks lie at the heart of distributed quantum computing and secure quantum communication - research areas that have seen a strong increase of interest over the last decade. Their basic architecture consist of stationary nodes composed of quantum processors which are linked via photonic channels. The key requirement, and at the same time the most demanding challenge, is the efficient distribution of entanglement between distant nodes. The two ground states of single spins confined in self-assembled InGaAs quantum dots provide an effective two-level system for the implementation of quantum bits. Moreover, they offer strong transition dipole moments with outstanding photonic properties allowing for the realisation of close to ideal, high-bandwidth spin-photon interfaces. These properties are combined with the benefits of working in the solid state, such as scalability and integrability of devices, to form a promising candidate for the implementation of fast entanglement distribution. In this dissertation we provide the first implementation of a unit cell of a quantum network based on single electron spins in InGaAs. We use a probabilistic scheme based on spin-photon entanglement and the erasure of which path information to project the two distant spins into a maximally entangled Bell state. The successful generation of entanglement is verified through a reconstruction of the final two-spin state and we achieve an average fidelity of 61.6±2.3% at a record-high generation rate of 5.8\,{kHz}. One of the main constraints to the achieved fidelity is the limited coherence of the electron spin. We show that it can be extended by three orders of magnitude through decoupling techniques and develop a new measurement technique, allowing us to investigate the origins of the decoherence which has previously been obscured by nuclear feedback processes. Our results evidence that further extension of coherence is ultimately limited by intrinsic mechanisms closely related to local strain due to the growth method of self-assembled quantum dots. After establishing the intrinsic limits to the electron coherence we investigate the coherence properties of the single hole spin as an alternative two-level system with the potential for higher coherence times. We show that the hole spin coherence is indeed superior to the one of the electron and realise the first successful dynamic decoupling scheme implemented in these systems. We find that the decoherence at low external magnetic fields is still governed by coupling to the nuclear spins whereas it is dominated by electrical noise for fields exceeding a few Tesla. This noise source is extrinsic to the quantum dots and a better understanding offers the potential for further improvement of the coherence time. The findings of this work present a complete study of the coherence of the charge carriers in self-assembled quantum dots and provide the knowledge needed to improve the implementation of a quantum-dot based quantum network. In particular, the combination of…

Subjects/Keywords: 621.3815; Quantum Dot; Quantum Networks; Spin; Electron; Hole; InGaAs; Nanostructure; Quantum Computing; Quantum Information; Quantum Communication

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APA (6^th Edition):

Huthmacher, L. (2018). Investigation of efficient spin-photon interfaces for the realisation of quantum networks. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.24440 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744945

Chicago Manual of Style (16^th Edition):

Huthmacher, Lukas. “Investigation of efficient spin-photon interfaces for the realisation of quantum networks.” 2018. Doctoral Dissertation, University of Cambridge. Accessed March 08, 2021. https://doi.org/10.17863/CAM.24440 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744945.

MLA Handbook (7^th Edition):

Huthmacher, Lukas. “Investigation of efficient spin-photon interfaces for the realisation of quantum networks.” 2018. Web. 08 Mar 2021.

Vancouver:

Huthmacher L. Investigation of efficient spin-photon interfaces for the realisation of quantum networks. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2021 Mar 08]. Available from: https://doi.org/10.17863/CAM.24440 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744945.

Council of Science Editors:

Huthmacher L. Investigation of efficient spin-photon interfaces for the realisation of quantum networks. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://doi.org/10.17863/CAM.24440 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744945

Anna University

22. Shanker, N R. Study on quantum fourier transform and modified data parallel algorithm in image enhancement for multispectral images to improve the interpretability for land cover mapping; -.

Degree: Information and Communication Engineering, 2014, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/24320

►

In satellite imagery the degradation of image contrast and colour quality is a familiar problem which causes great difficulty for information extraction and visibility of… (more)

Subjects/Keywords: Information and communication engineering; Quantum Computing; Quantum Fourier Transform algorithm; Quantum Fourier Transformation; Satellite image

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APA (6^th Edition):

Shanker, N. R. (2014). Study on quantum fourier transform and modified data parallel algorithm in image enhancement for multispectral images to improve the interpretability for land cover mapping; -. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/24320

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shanker, N R. “Study on quantum fourier transform and modified data parallel algorithm in image enhancement for multispectral images to improve the interpretability for land cover mapping; -.” 2014. Thesis, Anna University. Accessed March 08, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/24320.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shanker, N R. “Study on quantum fourier transform and modified data parallel algorithm in image enhancement for multispectral images to improve the interpretability for land cover mapping; -.” 2014. Web. 08 Mar 2021.

Vancouver:

Shanker NR. Study on quantum fourier transform and modified data parallel algorithm in image enhancement for multispectral images to improve the interpretability for land cover mapping; -. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Mar 08]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/24320.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shanker NR. Study on quantum fourier transform and modified data parallel algorithm in image enhancement for multispectral images to improve the interpretability for land cover mapping; -. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/24320

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

23. Xu, Ruoxuan. Quantum experiments with single-photon spin-orbit lattice arrays.

Degree: 2019, University of Waterloo

URL: http://hdl.handle.net/10012/15066

► The thesis introduces two single-photon experiments with the lattice of spin-orbit arrays. The basic background knowledge has been introduced in Chapter 1. Chapters 2-4 describe… (more)

▼ The thesis introduces two single-photon experiments with the lattice of spin-orbit arrays. The basic background knowledge has been introduced in Chapter 1. Chapters 2-4 describe the detailed techniques used in these two experiments. In the first work, we implement a remote state preparation protocol on our single-photon orbital angular momentum (OAM) lattice state via hybrid-entanglement. Remote state preparation is a variant of quantum state teleportation where the sender knows the transmitted state. It is known to require fewer classical resources and exhibit a nontrivial trade-off between the entanglement and classical communication compared with quantum teleportation. Here we propose a state preparation scheme between two spatially separated photons sharing a hybrid-entangled polarization-OAM state. By sending one of the polarization-entangled photon pairs through Lattice of Optical Vortex prism pairs, we generate a two-dimensional lattice of spin-orbit coupled single-photons. We show that the measurement taken by an electron-multiplying intensified CCD camera on the transformed photons can be remotely prepared by the polarization projection of the other. Our protocol could have a significant impact on long-distance quantum communication with higher channel capacity and lead to more efficient and compatible quantum information processing techniques. The second experiment investigates the single-photon Talbot Effect in spin-orbit arrays. The Talbot Effect is a near-field diffraction effect, that occurs with the propagation of periodically structured waves. It has enabled several unique applications in optical metrology, image processing, data transmission, and matter-wave interferometry. We observe that upon propagation, the wavefronts of the single photons manifest self-imaging whereby the OAM lattice intensity profile is recovered. Furthermore, we show that the intensity distribution at each fractional Talbot distance is indicative of the periodic helical phase structure corresponding to a lattice of OAM states. This phenomenon is a significant addition to the toolbox of orbital angular momentum and spin-orbit techniques that are becoming increasingly important in optical implementations of quantum information.

Subjects/Keywords: quantum information; quantum communication; single-photon; OAM lattice; quantum optics; remote state preparation; Talbot Effect

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Xu, R. (2019). Quantum experiments with single-photon spin-orbit lattice arrays. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/15066

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Xu, Ruoxuan. “Quantum experiments with single-photon spin-orbit lattice arrays.” 2019. Thesis, University of Waterloo. Accessed March 08, 2021. http://hdl.handle.net/10012/15066.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Xu, Ruoxuan. “Quantum experiments with single-photon spin-orbit lattice arrays.” 2019. Web. 08 Mar 2021.

Vancouver:

Xu R. Quantum experiments with single-photon spin-orbit lattice arrays. [Internet] [Thesis]. University of Waterloo; 2019. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10012/15066.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Xu R. Quantum experiments with single-photon spin-orbit lattice arrays. [Thesis]. University of Waterloo; 2019. Available from: http://hdl.handle.net/10012/15066

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Australian National University

24. Vernaz-Gris, Pierre. Preparation of large cold atomic ensembles and applications in efficient light-matter interfacing .

Degree: 2018, Australian National University

URL: http://hdl.handle.net/1885/157347

► This cotutelle PhD thesis revolves around quantum optics experiments which involve large atomic ensembles. The study of light-matter interaction and its enhancement are crucial steps… (more)

Subjects/Keywords: cold atoms; quantum optics; quantum memory; quantum communication; electromagnetically-induced transparency; Raman memory

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APA (6^th Edition):

Vernaz-Gris, P. (2018). Preparation of large cold atomic ensembles and applications in efficient light-matter interfacing . (Thesis). Australian National University. Retrieved from http://hdl.handle.net/1885/157347

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Vernaz-Gris, Pierre. “Preparation of large cold atomic ensembles and applications in efficient light-matter interfacing .” 2018. Thesis, Australian National University. Accessed March 08, 2021. http://hdl.handle.net/1885/157347.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Vernaz-Gris, Pierre. “Preparation of large cold atomic ensembles and applications in efficient light-matter interfacing .” 2018. Web. 08 Mar 2021.

Vancouver:

Vernaz-Gris P. Preparation of large cold atomic ensembles and applications in efficient light-matter interfacing . [Internet] [Thesis]. Australian National University; 2018. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1885/157347.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Vernaz-Gris P. Preparation of large cold atomic ensembles and applications in efficient light-matter interfacing . [Thesis]. Australian National University; 2018. Available from: http://hdl.handle.net/1885/157347

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

25. DSouza, Ian. Silicon avalanche photodiodes for satellite based quantum communication.

Degree: 2018, University of Waterloo

URL: http://hdl.handle.net/10012/13913

► Single photons detectors are required for applications like quantum key distribution and testing Bell's inequalities. Silicon avalanche photodiodes (Si APD's) have advantages like low dark… (more)

▼ Single photons detectors are required for applications like quantum key distribution and testing Bell's inequalities. Silicon avalanche photodiodes (Si APD's) have advantages like low dark count rate. This thesis aims to experimentally characterize Si APD's under conditions experienced in low earth orbit on board a satellite and also develop supporting algorithms and simulations. In chapter 1, I motivate the use of Si APD's as single photon detectors on a satellite. I also briefly explain the how these APD's work and the related electronics. In chapter 2, I describe the test setup used in the laboratory at the Institute for Quantum Computing to characterize the APD's. I then explain how one goes about measuring and/or calculating the different characteristic parameters of the APD. These characteristics include breakdown voltage, output pulse characteristics, recharge time, dark counts, detection efficiency, timing jitter of APD, saturation value and afterpulsing probability. The aim of the lab characterization is to form a baseline measurement under nominal conditions before we introduce the APD to conditions of low Earth orbit. In chapter 3, the APD's are exposed to proton radiation which is expected in low Earth orbit. Such radiation causes displacement defects in the APD's substrate and increases dark counts. Previous work [1] has shown that thermal annealing (increasing the APD temperature for a period of time) is successful in decreasing the dark count rate to operational range. It is anticipated that multiple annealing instance would be needed in operation under constant bombardment of protons. The work in this thesis explores possibility of using annealing repeatedly by alternating instances of proton irradiation and annealing. Other parameters of the APD are also under scrutiny to see if they change over the course of this experiment. A secondary objective explores if it is better to anneal only when the dark count rate drops below a threshold value or anneal after fixed intervals of time regardless of the dark count rates. A novel algorithm is also developed to analyze the afterpulsing probability. The algorithm is applied to simulated thermal count and afterpulse timetags to demonstrate its effectiveness. It is also applied to the data set drawn from the experimental tests of proton irradiation and thermal annealing to calculate the afterpulsing probability. In chapter 4 the APD's are exposed to the vacuum conditions that they would encounter in low Earth orbit. The bracket and radiator are set to different temperatures to simulate thermal variations in orbit. The detectors are then characterized for the aforementioned parameters to ensure they are in operable range. In chapter 5, I distinguish between the usual notion of afterpulsing probability which relates to the probability of trapping of charge carriers and the observed afterpulsing probability which differs from the former due to dead time and recharge time. I then use first principles to derive the observed afteprulsing probability as…

Subjects/Keywords: Quantum; satellite; quantum information; quantum communication; qunantum key distribution; single photon detectors; avalanche photodiode

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APA (6^th Edition):

DSouza, I. (2018). Silicon avalanche photodiodes for satellite based quantum communication. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/13913

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

DSouza, Ian. “Silicon avalanche photodiodes for satellite based quantum communication.” 2018. Thesis, University of Waterloo. Accessed March 08, 2021. http://hdl.handle.net/10012/13913.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

DSouza, Ian. “Silicon avalanche photodiodes for satellite based quantum communication.” 2018. Web. 08 Mar 2021.

Vancouver:

DSouza I. Silicon avalanche photodiodes for satellite based quantum communication. [Internet] [Thesis]. University of Waterloo; 2018. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10012/13913.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

DSouza I. Silicon avalanche photodiodes for satellite based quantum communication. [Thesis]. University of Waterloo; 2018. Available from: http://hdl.handle.net/10012/13913

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Leiden University

26. Bakermans, Jacob. Stable emission and excitation of the nitrogen-vacancy centre for quantum communication.

Degree: 2016, Leiden University

URL: http://hdl.handle.net/1887/43200

► In a quantum network, interconnected nodes use shared entangled states as a resource for communication. The nitrogen-vacancy (NV) centre in diamond is a promising candidate… (more)

Subjects/Keywords: quantum communication; nitrogen-vacancy centre; quantum network; laser

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APA (6^th Edition):

Bakermans, J. (2016). Stable emission and excitation of the nitrogen-vacancy centre for quantum communication. (Masters Thesis). Leiden University. Retrieved from http://hdl.handle.net/1887/43200

Chicago Manual of Style (16^th Edition):

Bakermans, Jacob. “Stable emission and excitation of the nitrogen-vacancy centre for quantum communication.” 2016. Masters Thesis, Leiden University. Accessed March 08, 2021. http://hdl.handle.net/1887/43200.

MLA Handbook (7^th Edition):

Bakermans, Jacob. “Stable emission and excitation of the nitrogen-vacancy centre for quantum communication.” 2016. Web. 08 Mar 2021.

Vancouver:

Bakermans J. Stable emission and excitation of the nitrogen-vacancy centre for quantum communication. [Internet] [Masters thesis]. Leiden University; 2016. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1887/43200.

Council of Science Editors:

Bakermans J. Stable emission and excitation of the nitrogen-vacancy centre for quantum communication. [Masters Thesis]. Leiden University; 2016. Available from: http://hdl.handle.net/1887/43200

University of Oxford

27. Reim, Klaus Franz. Broadband optical quantum memory.

Degree: PhD, 2011, University of Oxford

URL: http://ora.ox.ac.uk/objects/uuid:d0d73ed2-32c2-4de9-8b3d-fcf8b88b22b4 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543538

► This thesis is about the experimental implementation of a high-speed and robust quantum memory for light. A novel far off-resonant Raman approach to ensemble-based quantum… (more)

Subjects/Keywords: 621.39; Atomic and laser physics; quantum information; quantum communication

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APA (6^th Edition):

Reim, K. F. (2011). Broadband optical quantum memory. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:d0d73ed2-32c2-4de9-8b3d-fcf8b88b22b4 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543538

Chicago Manual of Style (16^th Edition):

Reim, Klaus Franz. “Broadband optical quantum memory.” 2011. Doctoral Dissertation, University of Oxford. Accessed March 08, 2021. http://ora.ox.ac.uk/objects/uuid:d0d73ed2-32c2-4de9-8b3d-fcf8b88b22b4 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543538.

MLA Handbook (7^th Edition):

Reim, Klaus Franz. “Broadband optical quantum memory.” 2011. Web. 08 Mar 2021.

Vancouver:

Reim KF. Broadband optical quantum memory. [Internet] [Doctoral dissertation]. University of Oxford; 2011. [cited 2021 Mar 08]. Available from: http://ora.ox.ac.uk/objects/uuid:d0d73ed2-32c2-4de9-8b3d-fcf8b88b22b4 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543538.

Council of Science Editors:

Reim KF. Broadband optical quantum memory. [Doctoral Dissertation]. University of Oxford; 2011. Available from: http://ora.ox.ac.uk/objects/uuid:d0d73ed2-32c2-4de9-8b3d-fcf8b88b22b4 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543538

Georgia Tech

28. Tahmasbi, Mehrdad. Covert Communication: from classical channels to quantum channels.

Degree: PhD, Electrical and Computer Engineering, 2020, Georgia Tech

URL: http://hdl.handle.net/1853/62796

► The objective of this dissertation is to study covert communications over classical and quantum channels. In contrast to the well-studied notion of secrecy, in which… (more)

Subjects/Keywords: Covert communication; Information theory; Quantum key distribution

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APA (6^th Edition):

Tahmasbi, M. (2020). Covert Communication: from classical channels to quantum channels. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/62796

Chicago Manual of Style (16^th Edition):

Tahmasbi, Mehrdad. “Covert Communication: from classical channels to quantum channels.” 2020. Doctoral Dissertation, Georgia Tech. Accessed March 08, 2021. http://hdl.handle.net/1853/62796.

MLA Handbook (7^th Edition):

Tahmasbi, Mehrdad. “Covert Communication: from classical channels to quantum channels.” 2020. Web. 08 Mar 2021.

Vancouver:

Tahmasbi M. Covert Communication: from classical channels to quantum channels. [Internet] [Doctoral dissertation]. Georgia Tech; 2020. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/1853/62796.

Council of Science Editors:

Tahmasbi M. Covert Communication: from classical channels to quantum channels. [Doctoral Dissertation]. Georgia Tech; 2020. Available from: http://hdl.handle.net/1853/62796

University of Limerick

29. Slattery, Oliver T. Development of single-photon sources, detectors, spectrometers and interfaces for quantum communication systems.

Degree: 2015, University of Limerick

URL: http://hdl.handle.net/10344/4844

►

peer-reviewed

This thesis describes work on single-photon pair creation, entanglement and entanglement measurement; single-photon spectral narrowing for atomic interaction; and single-photon detection and spectral analysis.… (more)

▼

peer-reviewed

This thesis describes work on single-photon pair creation, entanglement and entanglement measurement; single-photon spectral narrowing for atomic interaction; and single-photon detection and spectral analysis. The systems developed exploit the interactions of light beams in non-linear crystal materials. Greatly non-degenerate time-bin entangled photon pair sources are implemented based on the quantum process of spontaneous-parametric-down-conversion. The non-degenerate wavelengths correspond to an atomic transition (895 nm) and a telecommunications band (1310 nm). Interference-fringe-visibilities of over 78% are achieved, verifying entanglement. An efficient and low-noise single-photon up-conversion detector based on sum-frequency-generation is implemented. Photons at 1310 nm are converted to the visible region and efficiently detected using a visible single-photon detector. An overall detection efficiency of over 32% is achieved with a dark-count noise rate of 2500 s-1. The detector is further developed to achieve an inter-symbol-interference free detection rate at twice the limit of the type of visible detector used. The detector is adapted into an up-conversion spectrometer for wavelengths near 1310 nm. A sensitivity of -126 dBm is achieved, corresponding to photon fluxes of approximately 500 s-1. The up-conversion spectrometer is further adapted for correlated biphoton spectroscopy by incorporating a frequency entangled and time correlated source. In this scheme, the spectral function near 895 nm of a remote object can be reproduced by locally measuring the 1310 nm with the up-conversion spectrometer and monitoring the coincidence detection rates. To achieve linewidths feasible for atomic interaction, a very narrow linewidth non-degenerate single-photon pair source is implemented based on spontaneous-parametric-down-conversion embedded in a singly-resonant cavity which is locked to and resonating at the frequency corresponding to a target atomic transition. Linewidths as narrow as 28 MHz are achieved. The brightness of the source within the modes is increased by two-orders compared to the single-pass implementations.

Advisors/Committee Members: Buckley, Noel, Lynch, Robert P., IRC.

Subjects/Keywords: single-photon sources; quantum communication systems

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APA (6^th Edition):

Slattery, O. T. (2015). Development of single-photon sources, detectors, spectrometers and interfaces for quantum communication systems. (Thesis). University of Limerick. Retrieved from http://hdl.handle.net/10344/4844

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Slattery, Oliver T. “Development of single-photon sources, detectors, spectrometers and interfaces for quantum communication systems.” 2015. Thesis, University of Limerick. Accessed March 08, 2021. http://hdl.handle.net/10344/4844.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Slattery, Oliver T. “Development of single-photon sources, detectors, spectrometers and interfaces for quantum communication systems.” 2015. Web. 08 Mar 2021.

Vancouver:

Slattery OT. Development of single-photon sources, detectors, spectrometers and interfaces for quantum communication systems. [Internet] [Thesis]. University of Limerick; 2015. [cited 2021 Mar 08]. Available from: http://hdl.handle.net/10344/4844.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Slattery OT. Development of single-photon sources, detectors, spectrometers and interfaces for quantum communication systems. [Thesis]. University of Limerick; 2015. Available from: http://hdl.handle.net/10344/4844

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Louisiana State University

30. Gupta, Manish Kumar. Minimizing Decoherence in Optical Fiber for Long Distance Quantum Communication.

Degree: PhD, Physical Sciences and Mathematics, 2016, Louisiana State University

URL: etd-06162016-142835 ; https://digitalcommons.lsu.edu/gradschool_dissertations/2314

► In this research work, I have derived analytical models for decoherence of quantum states of light and developed techniques based on Dynamical Decoupling (DD) to… (more)

▼ In this research work, I have derived analytical models for decoherence of quantum states of light and developed techniques based on Dynamical Decoupling (DD) to preserve the quantum state of polarization qubit and Orbital Angular Momentum (OAM) qudit in single-mode, multi-mode and specialized optical fibers. In subsequent work, I have derived the analytical model for decoherence of an entangled state in an optical fiber to show that such a decoherence causes loss of entanglement. I also showed that such states can be preserved with DD. In Chapter 1, I have introduced the subject of a quantum computer and its relation to quantum communication. I give a brief overview of fundamental concepts and tools required to understand the subject matter. In Chapter 2, I discuss optical fibers from the perspective of the electromagnetic wave in a waveguide and explain the modes in an optical fiber. Later, I explain about the sources of noise or refractive index fluctuation in an optical fiber and show how to numerically reproduce a model of an optical fiber. In Chapter 3, I introduce the topic of quantum decoherence and discuss in detail an open-loop control technique called Dynamical Decoupling, that is applied to the system to minimize decoherence. I discuss ideal and nonideal pulse sequences used for suppressing decoherence. In Chapter 4, I derive the analytical model for decoherence of a polarization qubit in a single-mode, multi-mode fiber, and decoherence OAM qudit in specialized multi-mode fiber. In Chapter 5, I introduce the topic of entanglement for the bipartite system and multi-partite system, and a measure called concurrence to quantify the entanglement. I then derive the analytic model for decoherence of a pure entangled state and show that decoherence causes loss of entanglement for the case of a pure and mixed Werner-like state. \break In Chapter 6, I discuss the method of numerical simulation and show by numerical simulation that polarization qubit, OAM qudit and entanglement of polarization qudit can be preserved with dynamical decoupling in an optical fiber. In Chapter 7, I have summarized the results and discuss the scope of future work. In the appendix, I have included additional research work not directly related to the current topic of decoherence in an optical fiber. To summarize my research, I have derived a model for decoherence and then numerically showed that a polarization qubit can be preserved in a single mode and multi-mode optical fiber. I also show that an OAM qudit can be preserved for a certain maximum value of quantum number "l". Finally, I show that entanglement of pure and Werner mixed states can be preserved.

Subjects/Keywords: Optical Fiber; Qubit; OAM; Quantum Communication; Decoherence

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gupta, M. K. (2016). Minimizing Decoherence in Optical Fiber for Long Distance Quantum Communication. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-06162016-142835 ; https://digitalcommons.lsu.edu/gradschool_dissertations/2314

Chicago Manual of Style (16^th Edition):

Gupta, Manish Kumar. “Minimizing Decoherence in Optical Fiber for Long Distance Quantum Communication.” 2016. Doctoral Dissertation, Louisiana State University. Accessed March 08, 2021. etd-06162016-142835 ; https://digitalcommons.lsu.edu/gradschool_dissertations/2314.

MLA Handbook (7^th Edition):

Gupta, Manish Kumar. “Minimizing Decoherence in Optical Fiber for Long Distance Quantum Communication.” 2016. Web. 08 Mar 2021.

Vancouver:

Gupta MK. Minimizing Decoherence in Optical Fiber for Long Distance Quantum Communication. [Internet] [Doctoral dissertation]. Louisiana State University; 2016. [cited 2021 Mar 08]. Available from: etd-06162016-142835 ; https://digitalcommons.lsu.edu/gradschool_dissertations/2314.

Council of Science Editors:

Gupta MK. Minimizing Decoherence in Optical Fiber for Long Distance Quantum Communication. [Doctoral Dissertation]. Louisiana State University; 2016. Available from: etd-06162016-142835 ; https://digitalcommons.lsu.edu/gradschool_dissertations/2314

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