Comprehensive experimental test of quantum erasure

Details Comprehensive experimental test of quantum erasure Comprehensive experimental test of quantum erasure

2000-09-22

arxiv.org/abs/quant-ph/0009097v1

Eur. Phys. J. D 18 (2002) 251-258

Physics

Quantum Physics

8 pages, 8 figures, REVTeX

Scientific paper

10.1140/epjd/e20020030

In an interferometer, path information and interference visibility are incompatible quantities. Complete determination of the path will exclude any possibility of interference, rendering the visibility zero. However, if the composite object and probe state is pure, it is, under certain conditions, possible to trade the path information for improved (conditioned) visibility. Such a procedure is called quantum erasure. We have performed such experiments with polarization entangled photon pairs. Using a partial polarizer we could vary the degree of entanglement between object and probe. We could also vary the interferometer splitting ratio and thereby vary the a priori path predictability. We have tested quantum erasure under a number of different experimental conditions and found good agreement between experiments and theory.

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