Time-reversal and super-resolving phase measurements

Details Time-reversal and super-resolving phase measurements Time-reversal and super-resolving phase measurements

2005-11-22

arxiv.org/abs/quant-ph/0511214v2

Phys.Rev.Lett.98:223601,2007

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.98.223601

We demonstrate phase super-resolution in the absence of entangled states. The key insight is to use the inherent time-reversal symmetry of quantum mechanics: our theory shows that it is possible to \emph{measure}, as opposed to prepare, entangled states. Our approach is robust, requiring only photons that exhibit classical interference: we experimentally demonstrate high-visibility phase super-resolution with three, four, and six photons using a standard laser and photon counters. Our six-photon experiment demonstrates the best phase super-resolution yet reported with high visibility and resolution.

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