Classical Bound for Mach-Zehnder Super-Resolution

Details Classical Bound for Mach-Zehnder Super-Resolution Classical Bound for Mach-Zehnder Super-Resolution

2010-02-03

arxiv.org/abs/1002.0684v1

Phys. Rev. Lett. 104, 123602 (2010) [4 pages]

Physics

Quantum Physics

4 pages, 4 figure, Comments welcome

Scientific paper

The employment of path entangled multiphoton states enables measurement of phase with enhanced precision. It is common practice to demonstrate the unique properties of such quantum states by measuring super-resolving oscillations in the coincidence rate of a Mach-Zehnder interferometer. Similar oscillations, however, have also been demonstrated in various configurations using classical light only; making it unclear what, if any, are the classical limits of this phenomenon. Here we derive a classical bound for the visibility of super-resolving oscillations in a Mach-Zehnder. This provides an easy to apply, fundamental test of non-classicality. We apply this test to experimental multiphoton coincidence measurements obtained using photon number resolving detectors. Mach-Zehnder super-resolution is found to be a highly distinctive quantum effect.

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