Lower bound for electron spin entanglement from beamsplitter current correlations

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dc.creatorBurkard, Guido
dc.creatorLoss, Daniel
dc.date2003-03-11
dc.date.accessioned2026-07-07T02:50:08Z
dc.date.available2026-07-07T02:50:08Z
dc.descriptionWe determine a lower bound for the entanglement of pairs of electron spins injected into a mesoscopic conductor. The bound can be expressed in terms of experimentally accessible quantities, the zero-frequency current correlators (shot noise power or cross-correlators) after transmission through an electronic beam splitter. The effect of spin relaxation (T_1 processes) and decoherence (T_2 processes) during the ballistic coherent transmission of the carriers in the wires is taken into account within Bloch theory. The presence of a variable inhomogeneous magnetic field allows the determination of a useful lower bound for the entanglement of arbitrary entangled states. The decrease in entanglement due to thermally mixed states is studied. Both the entanglement of the output of a source (entangler) and the relaxation (T_1) and decoherence (T_2) times can be determined.
dc.description4 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0303209
dc.identifierhttp://arxiv.org/abs/cond-mat/0303209
dc.identifierPhys. Rev. Lett. 91, 087903 (2003).
dc.identifierdoi:10.1103/PhysRevLett.91.087903
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/21007
dc.subjectMesoscale and Nanoscale Physics
dc.subjectQuantum Physics
dc.titleLower bound for electron spin entanglement from beamsplitter current correlations
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