Bell inequalities and entanglement in solid-state devices

By N. Chtchelkatchev, G. Blatter, G. Lesovik, T. Martin. 2001

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Bell-inequality checks constitute a probe of entanglement-given a source of entangled particles, their violation is a signature of the nonlocal 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.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/8d5a4966f16674564bd1fc5f13db895dd2374865