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1. Niskanen, Antti O. Control of Quantum Evolution and Josephson Junction Circuits.

Degree: 2004, VTT Technical Research Centre of Finland

Ever since Peter Shor's ground-breaking discovery in 1994 of an algorithm capable of factoring large integers on a quantum-mechanical computer exponentially faster than using any known classical method, research on quantum computing has boomed. Quantum information – a unique mixture of computer science, physics and mathematics – has developed into a new branch of information theory. On the experimental side, physicists from many different disciplines including atomic, solid-state and low-temperature physics, as well as optics, are striving today towards a practical quantum computer. All the candidate quantum bit (qubit) technologies have one thing in common: They rely on the controlled time-evolution of a closed quantum system, a seemingly paradoxical task. In this Thesis the temporal control of quantum systems is studied. The topics included can be divided into two according to the type of temporal evolution; geometrical or dynamical. Geometrical realization-independent methods for quantum computing are studied first. Then the study is extended into dynamical quantum computing and the so-called Josephson charge-qubit register is considered as a test bench. Finally, a spin-off application of the geometrical evolution of a Josephson junction system is studied, i.e. Cooper pair pumping. A novel Cooper pair pump, the Cooper pair "sluice", is introduced. The work on quantum computing reported in this Thesis is theoretical while the Cooper pair "sluice" is studied both theoretically and experimentally. Numerical simulations, both sequential and parallel, are used extensively throughout the Thesis. The experiments were carried out under cryogenic mK conditions and the sample fabrication was done using e-beam nanolithography. Because the execution time of a quantum algorithm is always limited by the inevitable process of decoherence, it is important to utilize any measure available for accelerating quantum computations. It is found that practical quantum algorithms could greatly benefit from classical computer-aided optimization. Moreover, it is found that even a modest demonstrator of a full quantum algorithm using Josephson charge qubits is just barely realizable within present-day coherence times. However, the experimental part of this Thesis shows clear evidence of the functioning of the "sluice". While the worldwide effort of improving the coherence properties of qubits is underway, the "sluice" could well find practical use, e.g., in metrology in the foreseeable future.

VTT publications, ISSN 1455-0849; 552

Advisors/Committee Members: Helsinki University of Technology, Department of Engineering Physics and Mathematics, VTT Information Technology.

Subjects/Keywords: quantum systems; quantum mechanics; quantum computing; quantum algorithms; Cooper pair pumping

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

APA (6th Edition):

Niskanen, A. O. (2004). Control of Quantum Evolution and Josephson Junction Circuits. (Thesis). VTT Technical Research Centre of Finland. Retrieved from http://lib.tkk.fi/Diss/2004/isbn9513864219/

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

Chicago Manual of Style (16th Edition):

Niskanen, Antti O. “Control of Quantum Evolution and Josephson Junction Circuits.” 2004. Thesis, VTT Technical Research Centre of Finland. Accessed January 24, 2020. http://lib.tkk.fi/Diss/2004/isbn9513864219/.

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

MLA Handbook (7th Edition):

Niskanen, Antti O. “Control of Quantum Evolution and Josephson Junction Circuits.” 2004. Web. 24 Jan 2020.

Vancouver:

Niskanen AO. Control of Quantum Evolution and Josephson Junction Circuits. [Internet] [Thesis]. VTT Technical Research Centre of Finland; 2004. [cited 2020 Jan 24]. Available from: http://lib.tkk.fi/Diss/2004/isbn9513864219/.

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

Council of Science Editors:

Niskanen AO. Control of Quantum Evolution and Josephson Junction Circuits. [Thesis]. VTT Technical Research Centre of Finland; 2004. Available from: http://lib.tkk.fi/Diss/2004/isbn9513864219/

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

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