With photon-number resolving detectors, we show compression of interference fringes with increasing photon numbers for both Michelson and Fabry-Perot interferometers. We also theoretically show supersensitivity for nonclassical light.

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Interferometry with a photon-number resolving detector

We use a photon-number-resolving detector to monitor the photon-number distribution of the output of an interferometer, as a function of phase delay. As inputs we use coherent states with mean photon number up to seven. The postselection of a specific Fock (photon-number) state effectively induces high-order optical nonlinearities. Following a scheme by Bentley and Boyd [Opt. Express 12, 5735 (2004).10.1364/OPEX.12.005735], we explore this effect to demonstrate interference patterns a factor of 5 smaller than the Rayleigh limit.

https://web.physics.ucsb.edu/~quopt/non_int.pdf

Interferometry with a photon-number resolving detector

References

Nonlinear interferometry via Fock-state projection.

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