Dephasing of entangled electron-hole pairs in a degenerate electron gas

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dc.creatorvan Velsen, J. L.
dc.creatorKindermann, M.
dc.creatorBeenakker, C. W. J.
dc.date2003-07-09
dc.date.accessioned2026-07-07T02:52:15Z
dc.date.available2026-07-07T02:52:15Z
dc.descriptionA tunnel barrier in a degenerate electron gas was recently discovered as a source of entangled electron-hole pairs. Here, we investigate the loss of entanglement by dephasing. We calculate both the maximal violation E_max of the Bell inequality and the degree of entanglement (concurrence) C. If the initially maximally entangled electron-hole pair is in a Bell state, then the Bell inequality is violated for arbitrary strong dephasing. The same relation E_max=2\sqrt{1+C^{2}} then holds as in the absence of dephasing. More generally, for a maximally entangled superposition of Bell states, the Bell inequality is satisfied for a finite dephasing strength and the entanglement vanishes for somewhat stronger (but still finite) dephasing strength. There is then no one-to-one relation between E_max and C.
dc.description7 pages with 3 figures, special style file included; To appear in a special issue on "Quantum Computation at the Atomic Scale" in Turkish Journal of Physics
dc.identifierhttps://arxiv.org/abs/cond-mat/0307198
dc.identifierhttp://arxiv.org/abs/cond-mat/0307198
dc.identifierTurk. J. Phys. 27, 323 (2003)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/21772
dc.subjectCondensed Matter
dc.subjectQuantum Physics
dc.titleDephasing of entangled electron-hole pairs in a degenerate electron gas
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