Optimal states and almost optimal adaptive measurements for quantum interferometry

Berry, D. W. and Wiseman, H. M. (2000) Optimal states and almost optimal adaptive measurements for quantum interferometry. Physical Review Letters, 85 24: 5098-5101. doi:10.1103/PhysRevLett.85.5098

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Author Berry, D. W.
Wiseman, H. M.
Title Optimal states and almost optimal adaptive measurements for quantum interferometry
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
1079-7114
1092-0145
Publication date 2000-12-11
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.85.5098
Open Access Status File (Publisher version)
Volume 85
Issue 24
Start page 5098
End page 5101
Total pages 4
Place of publication College Park, MD, U.S.A.
Publisher American Physical Society
Collection year 2000
Language eng
Subject C1
240201 Theoretical Physics
780102 Physical sciences
Formatted 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.
© 2000 The American Physical Society.
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
School of Physical Sciences Publications
 
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Created: Tue, 10 Jun 2008, 12:10:05 EST