Electronic entanglement in the vicinity of a superconductor

  • G.B. Lesovik
  • T. Martin
  • G. Blatter

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. This solid state entangler is characterized by noise cross-correlations which are identical to the noise in one lead, a signature consistent with entanglement. A connection to Bell-type experiments is envisioned (cond-mat/0009193).

PACS. 03.67.Hk Quantum communication – 72.70.+m Noise processes and phenomena – 74.50.+r Proximity effects, weak links, tunneling phenomena, and Josephson effects 

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Copyright information

© EDP Sciences, Springer-Verlag 2001

Authors and Affiliations

  • G.B. Lesovik
    • 1
  • T. Martin
    • 2
  • G. Blatter
    • 3
  1. 1.L.D. Landau Institute for Theoretical Physics, Russian Academy of Sciences, Kosygina Str. 2, 117940, Moscow, RussiaRU
  2. 2.Centre de Physique Théorique et Université de la Méditerranée, Case 907, 13288 Marseille, FranceFR
  3. 3.Theoretische Physik, ETH-Hönggerberg, 8093 Zürich, SwitzerlandCH

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