Nonlocal entanglement in hybrid superconducting and normal-metal three terminal devices
arXiv:0910.5558 · doi:10.1038/NPHYS1669
Abstract
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.
7 pages, 4 figures
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- Non-Local Correlations in Normal Metal-Superconducting Systems
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- Current-current correlations in hybrid superconducting and normal metal multiterminal structures
- Nonlocal Andreev reflection at high transmissions
- Contact resistance dependence of crossed Andreev reflection
- Reduced and projected two-particle entanglement at finite temperatures
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