Entanglement of electrons field-emitted from a superconductor

Kazuya Yuasa; Paolo Facchi; Rosario Fazio; Hiromichi Nakazato; Ichiro Ohba; Saverio Pascazio; Shuichi Tasaki

doi:10.1103/PhysRevB.79.180503

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Entanglement of electrons field-emitted from a superconductor

Kazuya Yuasa, Paolo Facchi, Rosario Fazio, Hiromichi Nakazato, Ichiro Ohba, Saverio Pascazio, Shuichi Tasaki

DOI 10.1103/PhysRevB.79.180503 · Physical Review B

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Abstract

Under appropriate circumstances the electrons emitted from a superconducting tip can be entangled. We analyze these nonlocal correlations by studying the coincidences of the field-emitted electrons and show that electrons emitted in opposite directions violate Bell’s inequality. We scrutinize the interplay between the bosonic nature of Cooper pairs and the fermionic nature of electrons. We further discuss the feasibility of our analysis in the light of present experimental capabilities.