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

Kazuya Yuasa
Phys. Rev. B 80, 104516 – Published 29 September 2009

Abstract

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.

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  • Received 22 June 2009

DOI:https://doi.org/10.1103/PhysRevB.80.104516

©2009 American Physical Society

Authors & Affiliations

Kazuya Yuasa

  • Waseda Institute for Advanced Study, Waseda University, Tokyo 169-8050, Japan

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Issue

Vol. 80, Iss. 10 — 1 September 2009

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