Adaptive optical phase estimation using time-symmetric quantum smoothing

Wheatley, T. A., Berry, D. W., Yonezawa, H., Nakane, D., Arao, H., Pope, D. T., Ralph, T. C., Wiseman, H. M., Furusawa, A. and Huntington, E. H. (2011). Adaptive optical phase estimation using time-symmetric quantum smoothing. In: Timothy Ralph and Ping Koy Lam, Quantum Communication, Measurement and Computing (QCMC): The Tenth International Conference. 10th International Conference on Quantum Communication, Measurement and Computing (QCMC), Brisbane, Australia, (129-132). 19-23 July 2010.

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Author Wheatley, T. A.
Berry, D. W.
Yonezawa, H.
Nakane, D.
Arao, H.
Pope, D. T.
Ralph, T. C.
Wiseman, H. M.
Furusawa, A.
Huntington, E. H.
Title of paper Adaptive optical phase estimation using time-symmetric quantum smoothing
Conference name 10th International Conference on Quantum Communication, Measurement and Computing (QCMC)
Conference location Brisbane, Australia
Conference dates 19-23 July 2010
Proceedings title Quantum Communication, Measurement and Computing (QCMC): The Tenth International Conference   Check publisher's open access policy
Journal name AIP Conference Proceedings   Check publisher's open access policy
Place of Publication Melville, NY, United States
Publisher American Institute of Physics
Publication Year 2011
Sub-type Fully published paper
DOI 10.1063/1.3630163
ISBN 9780735409217
ISSN 0094-243X
1551-7616
Editor Timothy Ralph
Ping Koy Lam
Volume 1363
Start page 129
End page 132
Total pages 4
Collection year 2012
Language eng
Abstract/Summary We present an experimental demonstration of quantum smoothing, a non causal version of quantum parameter estimation that has applications from gravitational wave detection to quantum key distribution. An existing technique for this type of parameter estimation is quantum filtering, which uses past observations only. The technique presented here is time‐symmetric that uses past and future observations to obtain a more precise estimate. We couple this innovative estimation technique with an adaptive detection scheme to demonstrate an estimation of the optical phase of light measured to be 2.24 ± 0.14 times better than the standard quantum limit. This approaches our theoretically derived prediction of a mean square error improvement of 2math times over the standard quantum limit [1].
Keyword Quantum computing
Spectral filters
Adaptive optics
Quantum noise
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Mathematics and Physics
Official 2012 Collection
 
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