The Faraday Quantum Clock and Non-local Photon Pair Correlations

Details The Faraday Quantum Clock and Non-local Photon Pair Correlations The Faraday Quantum Clock and Non-local Photon Pair Correlations

1999-04-12

arxiv.org/abs/quant-ph/9904044v1

Physics

Quantum Physics

6 figures

Scientific paper

10.1103/PhysRevA.60.1811

We study the use of the Faraday effect as a quantum clock for measuring traversal times of evanescent photons through magneto-refractive structures. The Faraday effect acts both as a phase-shifter and as a filter for circular polarizations. Only measurements based on the Faraday phase-shift properties are relevant to the traversal time measurements. The Faraday polarization filtering may cause the loss of non-local (Einstein-Podolsky-Rosen) two-photon correlations, but this loss can be avoided without sacrificing the clock accuracy. We show that a mechanism of destructive interference between consecutive paths is responsible for superluminal traversal times measured by the clock.

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