Quantum Coherence of Electrons Field-Emitted from a Superconductor: Correlations and Entanglement
arXiv:0906.4042 · doi:10.1103/PhysRevB.80.104516
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.
21 pages, 9 figures, typos corrected
References in corpus (8)
- Camparison of the Hanbury Brown-Twiss effect for bosons and fermions
- Evidence for crossed Andreev reflection in superconductor-ferromagnet hybrid structures
- Production and detection of entangled electron-hole pairs in a degenerate electron gas
- Current-current correlations in hybrid superconducting and normal metal multiterminal structures
- Direct experimental evidence of free fermion antibunching
- Entanglement of Electrons Field-Emitted from a Superconductor
- Maximal positive cross shot noise from Andreev reflection
- Lateral Effects in Fermion Antibunching