Bell inequalities and entanglement in solid state devices

Details Bell inequalities and entanglement in solid state devices Bell inequalities and entanglement in solid state devices

2001-12-06

arxiv.org/abs/cond-mat/0112094v3

Physical Review B vol. 66, 161320(R) (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 1 figure

Scientific paper

10.1103/PhysRevB.66.161320

Bell-inequality checks constitute a probe of entanglement -- given a source of entangled particles, their violation are a signature of the non-local nature of quantum mechanics. Here, we study a solid state device producing pairs of entangled electrons, a superconductor emitting Cooper pairs properly split into the two arms of a normal-metallic fork with the help of appropriate filters. We formulate Bell-type inequalities in terms of current-current cross-correlators, the natural quantities measured in mesoscopic physics; their violation provides evidence that this device indeed is a source of entangled electrons.

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