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Phase detection at the quantum limit with multiphoton Mach-Zehnder interferometry (Articolo in rivista)

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Phase detection at the quantum limit with multiphoton Mach-Zehnder interferometry (Articolo in rivista) (literal)

Anno

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Alternative label

Pezze L.; Smerzi A.; Khoury G.; Hodelin J.F.; Bouwmeester D. (2007)
Phase detection at the quantum limit with multiphoton Mach-Zehnder interferometry
in Physical review letters (Print)
(literal)

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BEC CNR INFM, I-38050 Povo, Italy; Univ Trent, Dipartimento Fis, I-38050 Povo, Italy; Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA; Leiden Univ, Huygens Lab, NL-2300 RA Leiden, Netherlands (literal)

Titolo

Phase detection at the quantum limit with multiphoton Mach-Zehnder interferometry (literal)

Abstract

We study a Mach-Zehnder interferometer fed by a coherent state in one input port and vacuum in the other. We explore a Bayesian phase estimation strategy to demonstrate that it is possible to achieve the standard quantum limit independently from the true value of the phase shift and specific assumptions on the noise of the interferometer. We have been able to implement the protocol by using parallel operation of two photon-number-resolving detectors and multiphoton coincidence logic electronics at the output ports of a weakly illuminated Mach-Zehnder interferometer. This protocol is unbiased, saturates the Cramer-Rao phase uncertainty bound, and, therefore, is an optimal phase estimation strategy. (literal)

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