Phys. Rev. B 80, 104516 (2009) [19 pages]Quantum coherence of electrons field-emitted from a superconductor: Correlations and entanglementReceived 22 June 2009; revised 20 August 2009; published 29 September 2009 The correlations of the electrons field-emitted from a superconductor are fully analyzed, both in space and time. It is proposed that a coincidence experiment would reveal a positive correlation between the electrons emitted in opposite directions. The electrons can be entangled and can even violate Bell’s inequality. The crucial role played by Andreev’s process is scrutinized, analytical formulas are derived for the correlations, and the physics behind the phenomenon is clarified. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.104516
DOI:
10.1103/PhysRevB.80.104516
PACS:
03.65.Ud, 79.70.+q, 74.45.+c
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