Optimal States and Almost Optimal Adaptive Measurements for Quantum Interferometry

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Title Optimal States and Almost Optimal Adaptive Measurements for Quantum Interferometry
Author Berry, DW.; Wiseman, Howard Mark
Journal Name Physical Review Letters
Year Published 2000
Place of publication USA
Publisher American Physical Society
Abstract We derive the optimal N-photon two-mode input state for obtaining an estimate φ of the phase difference between two arms of an interferometer. For an optimal measurement [B. C. Sanders and G. J. Milburn, Phys. Rev. Lett. 75, 2944 (1995)], it yields a variance (Δφ)2≃π2/N2, compared to O(N-1) or O(N-1/2) for states considered by previous authors. Such a measurement cannot be realized by counting photons in the interferometer outputs. However, we introduce an adaptive measurement scheme that can be thus realized, and show that it yields a variance in φ very close to that from an optimal measurement
Peer Reviewed Yes
Published Yes
Publisher URI http://prola.aps.org/abstract/PRL/v85/i24/p5098_1
Alternative URI http://dx.doi.org/10.1103/PhysRevLett.85.5098
Copyright Statement Copyright 2000 American Physical Society. Reproduced in accordance with the copyright policy of the publisher. This journal is available online - use hypertext links.
Volume 85
Issue Number 24
Page from 5098
Page to 5102
ISSN 0031-9007
Date Accessioned 2001-01-01
Language en_AU
Research Centre Centre for Quantum Dynamics
Faculty Faculty of Science
Subject PRE2009-Science & Technology
URI http://hdl.handle.net/10072/3116
Publication Type Article in Scholarly Refereed Journal
Publication Type Code c1

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