Interference in dielectrics and pseudo-measurements

Details Interference in dielectrics and pseudo-measurements Interference in dielectrics and pseudo-measurements

1996-12-11

arxiv.org/abs/quant-ph/9612032v1

J.Mod.Opt. 45 (1998) 777

Physics

Quantum Physics

7 pages RevTeX 3.0 + 2 figures (postscript). Submitted to Phys. Rev. A

Scientific paper

Inserting a lossy dielectric into one arm of an interference experiment acts in many ways like a measurement. If two entangled photons are passed through the interferometer, a certain amount of information is gained about which path they took, and the interference pattern in a coincidence count measurement is suppressed. However, by inserting a second dielectric into the other arm of the interferometer, one can restore the interference pattern. Two of these pseudo-measurements can thus cancel each other out. This is somewhat analogous to the proposed quantum eraser experiments.

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