Local and nonlocal entanglement for quasiparticle pairs induced by Andreev reflection

Details Local and nonlocal entanglement for quasiparticle pairs induced by Andreev reflection Local and nonlocal entanglement for quasiparticle pairs induced by Andreev reflection

2006-08-22

arxiv.org/abs/cond-mat/0608469v1

PHYSICAL REVIEW B 74, 085312 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.74.085312

We investigate local and nonlocal entanglement of particle pairs induced by direct and crossed Andreev reflections at the interfaces between a superconductor and two normal conductors. It is shown theoretically that both local and nonlocal entanglement can be quantified by concurrence and detected from the violation of a Bell inequality of spin current correlators, which are determined only by normal reflection and Andreev reflection eigenvalues. There exists a one-to-one correspondence between the concurrence and the maximal Bell-CHSH parameter in the tunneling limit.

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