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Proceedings Paper

The effects of path absorption on phase sensitivity with entangled states
Author(s): Yang Gao; Hwang Lee
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Paper Abstract

It is known that the phase measurement using lossless Mach-Zehnder interferometer with certain entangled N-photon states can achieve a phase sensitivity of the order of 1/N, the Heisenberg limit. However, the output observable used is different for different input states to achieve the Heisenberg limit. In this paper, we show that it is possible to achieve this limit just by parity measurement for all the commonly proposed entangled states. Taking account of path absorption effect, the phase shifts with parity measurement for these states are obtained and indicate that the N00N state still remains to be the best candidate to perform phase detection if the transmittance of the medium is not too small and the number of photons is not very large.

Paper Details

Date Published: 11 February 2008
PDF: 7 pages
Proc. SPIE 6906, Quantum Electronics Metrology, 690609 (11 February 2008); doi: 10.1117/12.762353
Show Author Affiliations
Yang Gao, Louisiana State Univ. (United States)
Hwang Lee, Louisiana State Univ. (United States)

Published in SPIE Proceedings Vol. 6906:
Quantum Electronics Metrology
Alan E. Craig; Selim M. Shahriar, Editor(s)

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