Phase detection at the quantum limit with multi-photon Mach-Zehnder interferometry

Details Phase detection at the quantum limit with multi-photon Mach-Zehnder interferometry Phase detection at the quantum limit with multi-photon Mach-Zehnder interferometry

2007-01-22

arxiv.org/abs/quant-ph/0701158v2

Physics

Quantum Physics

4 pages, 5 figures replaced fig. 1 to correct graphics bug

Scientific paper

10.1103/PhysRevLett.99.223602

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 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 and saturates the Cramer-Rao phase uncertainty bound and, therefore, is an optimal phase estimation strategy.

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