Orbital entanglement and violation of Bell inequalities in mesoscopic conductors.
We propose a spin-independent scheme to generate and detect two-particle entanglement in a mesoscopic normal-superconductor system. A superconductor, weakly coupled to the normal conductor, generates an orbitally entangled state by injecting pairs of electrons into different leads of the normal conductor. The entanglement is detected via violation of a Bell inequality, formulated in terms of zero-frequency current cross correlators. It is shown that the Bell inequality can be violated for arbitrary strong dephasing in the normal conductor.
Samuelsson
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Département de Physique Théorique, Université de Genève, CH-1211 Genève 4, Switzerland.
Sukhorukov
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Büttiker
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