Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-10-29
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7 pages, 4 figures
Scientific paper
Nonlocal entanglement is crucial for quantum information processes. While nonlocal entanglement has been realized for photons, it is much more difficult to demonstrate for electrons. One approach that has been proposed is to use hybrid superconducting/normal-metal devices, where a Cooper pair splits into spin-entangled electrons in two spatially separated normal-metal leads. This process of nonlocal Andreev reflection is predicted to lead to a negative nonlocal resistance and positive current-current correlation. By cross-correlation measurements as well as measurements of the local and nonlocal resistance, we present here experimental evidence showing that by independently controlling the energy of electrons at the superconductor/normal-metal interfaces, nonlocal Andreev reflction, the signature of spin-entanglement, can be maximized.
Chandrasekhar Venkat
Wei Jian
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