Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-01-17
Phys. Rev. B 74, 045305 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
14 pages, 6 figures, updated with published version (appendix added)
Scientific paper
10.1103/PhysRevB.74.045305
We study the effect of inelastic scattering on the spin entanglement detection and discrimination scheme proposed by Egues, Burkard, and Loss [Phys. Rev. Lett. \textbf{89}, 176401 (2002)]. The finite-backscattering beam splitter geometry is supplemented by a phenomenological model for inelastic scattering, the charge-conserving voltage probe model, conveniently generalized to deal with entangled states. We find that the behavior of shot-noise measurements in one of the outgoing leads remains an efficient way to characterize the nature of the non-local spin correlations in the incoming currents for an inelastic scattering probability up to 50%. Higher order cumulants are analyzed, and are found to contain no additional useful information on the spin correlations. The technique we have developed is applicable to a wide range of systems with voltage probes and spin correlations.
Prada Elsa
San-Jose Pablo
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