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You searched for +publisher:"University of New South Wales" +contributor:("Huntington, Elanor, Research School of Engineering, College of Engineering and Computer Science, Australian National University"). One record found.

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University of New South Wales

1. Wheatley, Trevor. To the standard quantum limit and beyond: Experimental quantum parameter estimation using adaptive quantum smoothing.

Degree: Engineering & Information Technology, 2016, University of New South Wales

Quantum parameter estimation (QPE) is the ability to precisely estimate a classical parameter in a quantum system. QPE is important to many key quantum disciplines such as quantum control, gravitational wave detection and quantum key distribution. The discipline of QPE is driven by the pursuit of precision limited only by quantum mechanics, with benchmarks like the standard quantum limit (SQL) and the illusive Heisenberg limit. Many techniques promising greater precision have been proposed and demonstrated. Here we expand the QPE body of knowledge by demonstrating QPE techniques for estimating optical phase and mirror position in quantum optical systems. We demonstrate new and existing techniques, comparing the results with existing limits of precision. Our techniques lower traditional precision levels with further improvement obtained when quantum enhancement is employed.In this thesis we present results from the first demonstrations of adaptive and dual homodyne detection using time-asymmetric quantum filtering to estimate a continuously varying optical phase. In this work we approach the SQL using dual homodyne detection and go beyond the SQL by 1.2 +/- 0.08 times with an adaptive homodyne measurement.We additionally present results from the first experimental demonstration of optical phase estimation using time-symmetric quantum smoothing. Here we go beyond the SQL with both dual homodyne and adaptive homodyne by 2.24 +/- 0.14 times for the latter. This is extended to an experimental demonstration of quantum enhanced optical phase estimation using quantum smoothing. We define a new limit, the coherent state limit (CSL), our best precision achievable with a coherent state. With quantum enhancement we beat the CSL by approximately 15 +/- 4% and introduce a paradox where too much squeezing exists.We present theory and simulation validated by experiment for resonance enhanced quantum smoothing. When estimating the position of a mechanically resonant cavity mirror, this technique shows a precision enhancement of greater than two compared with optimal filtering. Previously smoothing enhancement has not exceeded two.Finally, theoretical and simulation results are provided for quantum enhanced mirror position estimation using resonant quantum smoothing. Our results indicate precision improvement of approximately 20 +/- 4% with quantum enhancement. Advisors/Committee Members: Petersen, Ian, Information Technology & Electrical Engineering, UNSW Canberra, UNSW, Huntington, Elanor, Research School of Engineering, College of Engineering and Computer Science, Australian National University.

Subjects/Keywords: Quantum control; Quantum parameter estimation; Quantum optics

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APA (6th Edition):

Wheatley, T. (2016). To the standard quantum limit and beyond: Experimental quantum parameter estimation using adaptive quantum smoothing. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/55888 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:39598/SOURCE02?view=true

Chicago Manual of Style (16th Edition):

Wheatley, Trevor. “To the standard quantum limit and beyond: Experimental quantum parameter estimation using adaptive quantum smoothing.” 2016. Doctoral Dissertation, University of New South Wales. Accessed October 27, 2020. http://handle.unsw.edu.au/1959.4/55888 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:39598/SOURCE02?view=true.

MLA Handbook (7th Edition):

Wheatley, Trevor. “To the standard quantum limit and beyond: Experimental quantum parameter estimation using adaptive quantum smoothing.” 2016. Web. 27 Oct 2020.

Vancouver:

Wheatley T. To the standard quantum limit and beyond: Experimental quantum parameter estimation using adaptive quantum smoothing. [Internet] [Doctoral dissertation]. University of New South Wales; 2016. [cited 2020 Oct 27]. Available from: http://handle.unsw.edu.au/1959.4/55888 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:39598/SOURCE02?view=true.

Council of Science Editors:

Wheatley T. To the standard quantum limit and beyond: Experimental quantum parameter estimation using adaptive quantum smoothing. [Doctoral Dissertation]. University of New South Wales; 2016. Available from: http://handle.unsw.edu.au/1959.4/55888 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:39598/SOURCE02?view=true

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