paper

Electronic Entanglement in the Vicinity of a Superconductor

arXiv:cond-mat/0009193 · doi:10.1007/s10051-001-8675-4

Abstract

A weakly biased normal-metal-superconductor junction is considered as a potential device injecting entangled pairs of quasi-particles into a normal-metal lead. The two-particle states arise from Cooper pairs decaying into the normal lead and are characterized by entangled spin- and orbital degrees of freedom. The separation of the entangled quasi-particles is achieved with a fork geometry and normal leads containing spin- or energy-selective filters. Measuring the current-current cross-correlator between the two normal leads allows to probe the efficiency of the entanglement.

4 pages, 2 eps figures, minor additions (including entangled wave function and particle number correlator)

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