Phase measurements at the theoretical limit

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Author(s)
Berry, DW
Wiseman, HM
Griffith University Author(s)
Year published
2001
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It is well known that the result of any phase measurement on an optical mode made using linear optics has an introduced uncertainty in addition to the intrinsic quantum phase uncertainty of the state of the mode. The best previously published technique [H. M. Wiseman and R. B. Killip, Phys. Rev. A 57, 2169 (1998)] is an adaptive technique that introduces a phase variance that scales as n¯−1.5 , where ¯n is the mean photon number of the state. This is far above the minimum intrinsic quantum phase variance of the state, which scales as ¯n − 2 . It has been shown that a lower limit to the phase variance that is introduced scales ...
View more >It is well known that the result of any phase measurement on an optical mode made using linear optics has an introduced uncertainty in addition to the intrinsic quantum phase uncertainty of the state of the mode. The best previously published technique [H. M. Wiseman and R. B. Killip, Phys. Rev. A 57, 2169 (1998)] is an adaptive technique that introduces a phase variance that scales as n¯−1.5 , where ¯n is the mean photon number of the state. This is far above the minimum intrinsic quantum phase variance of the state, which scales as ¯n − 2 . It has been shown that a lower limit to the phase variance that is introduced scales as ln(¯n ) / n¯ 2 . Here we introduce an adaptive technique that attains this theoretical lower limit.
View less >
View more >It is well known that the result of any phase measurement on an optical mode made using linear optics has an introduced uncertainty in addition to the intrinsic quantum phase uncertainty of the state of the mode. The best previously published technique [H. M. Wiseman and R. B. Killip, Phys. Rev. A 57, 2169 (1998)] is an adaptive technique that introduces a phase variance that scales as n¯−1.5 , where ¯n is the mean photon number of the state. This is far above the minimum intrinsic quantum phase variance of the state, which scales as ¯n − 2 . It has been shown that a lower limit to the phase variance that is introduced scales as ln(¯n ) / n¯ 2 . Here we introduce an adaptive technique that attains this theoretical lower limit.
View less >
Journal Title
Physical Review A
Volume
63
Issue
1
Copyright Statement
© 2001 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.
Subject
Mathematical Sciences
Physical Sciences
Chemical Sciences