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Quantum coherence of electrons field-emitted from a superconductor: Correlations and entanglement

Source: Phys. Rev. B 80, 104516 (2009); doi:10.1103/PhysRevB.80.104516

Published 29 September 2009

KEYWORDS and PACS
Keywords
PACS
  • 03.65.Ud
    Entanglement and quantum nonlocality
  • 79.70.+q
    Field emission, ionization, evaporation, and desorption
  • 74.45.+c
    Superconductor proximity effects; Andreev effect; SN and SNS junctions
  • YEAR: 2009
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PUBLICATION DATA
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Kazuya Yuasa
Waseda Institute for Advanced Study, Waseda University, Tokyo 169-8050, Japan
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
History: Received 22 June 2009; revised 20 August 2009; published 29 September 2009
Permalink: http://link.aps.org/abstract/PRB/v80/e104516

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