The effects of path absorption on phase sensitivity with entangled states

Yang Gao; Hwang Lee

doi:10.1117/12.762353

11 February 2008 The effects of path absorption on phase sensitivity with entangled states

Yang Gao, Hwang Lee

Proceedings Volume 6906, Quantum Electronics Metrology; 690609 (2008) https://doi.org/10.1117/12.762353
Event: Integrated Optoelectronic Devices 2008, 2008, San Jose, California, United States

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.

Citation Download Citation

Yang Gao and Hwang Lee "The effects of path absorption on phase sensitivity with entangled states", Proc. SPIE 6906, Quantum Electronics Metrology, 690609 (11 February 2008); https://doi.org/10.1117/12.762353

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