How to Perform the Most Accurate Possible Phase Measurements
How to perform the most accurate possible phase measurements Author Berry, DW, Higgins, BL, Bartlett, SD, Mitchell, MW, Pryde, GJ, Wiseman, HM Published 2009 Journal Title Physical Review A (Atomic, Molecular and Optical Physics) DOI https://doi.org/10.1103/PhysRevA.80.052114 Copyright Statement © 2009 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version. Downloaded from http://hdl.handle.net/10072/30941 Link to published version http://pra.aps.org/ Griffith Research Online https://research-repository.griffith.edu.au How to perform the most accurate possible phase measurements D. W. Berry,1, 2 B. L. Higgins,3 S. D. Bartlett,4 M. W. Mitchell,5 G. J. Pryde,3, ∗ and H. M. Wiseman3, † 1Institute for Quantum Computing, University of Waterloo, Waterloo, ON N2L 3G1, Canada 2Centre for Quantum Computer Technology, Department of Physics, Macquarie University, Sydney, 2109, Australia 3Centre for Quantum Dynamics, Griffith University, Brisbane, 4111, Australia 4School of Physics, University of Sydney, Sydney, 2006, Australia 5ICFO—Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain We present the theory of how to achieve phase measurements with the minimum possible variance in ways that are readily implementable with current experimental techniques. Measurements whose statistics have high-frequency fringes, such as those obtained from NOON states, have commensu- rately high information yield (as quantified by the Fisher information). However this information is also highly ambiguous because it does not distinguish between phases at the same point on different fringes.
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