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Beating the standard quantum limit : phase super-sensitivity of N-photon interferometers

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Title: Beating the standard quantum limit : phase super-sensitivity of N-photon interferometers
Authors: Okamoto, Ryo Browse this author →KAKEN DB
Hofmann, Holger F. Browse this author
Nagata, Tomohisa Browse this author
O'Brien, Jeremy L. Browse this author
Sasaki, Keiji Browse this author →KAKEN DB
Takeuchi, Shigeki Browse this author →KAKEN DB
Issue Date: Jul-2008
Publisher: Institute of Physics and Deutsche Physikalische Gesellschaft e.V.
Journal Title: New Journal of Physics
Volume: 10
Start Page: 073033
Publisher DOI: 10.1088/1367-2630/10/7/073033
Abstract: Quantum metrology promises greater sensitivity for optical phase measurements than could ever be achieved classically. Here, we present a theory of the phase sensitivity for the general case where the detection probability is given by an N photon interference fringe. We find that the phase sensitivity has a complicated dependence on both the intrinsic efficiency of detection η and the interference fringe visibility V. Most importantly, the phase that gives maximum phase sensitivity is in general not the same as the phase at which the slope of the interference fringe is a maximum, as has previously been assumed. We determine the parameter range where quantum enhanced sensitivity can be achieved. In order to illustrate these theoretical results, we perform a four-photon experiment with η = 3/4 and V = 82±6% (an extension of our previous work (Nagata et al 2007 Science 316 726)) and find a phase sensitivity 1.3 times greater than the standard quantum limit at a phase different to that which gives maximum slope of the interference fringe.
Rights: © 2008 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft
Type: article
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 竹内 繁樹

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