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Opt Express. 2014 Jan 27;22(2):1551-9. doi: 10.1364/OE.22.001551.

Concentration of entangled nitrogen-vacancy centers in decoherence free subspace.

Abstract

Exploiting the input-output process of low-Q cavities confining nitrogen-vacancy centers, we present an efficient entanglement concentration protocol on electron spin state in decoherence free subspace. Less entangled state can be concentrated to maximally entangled state with the assistance of single photon detection. With its robustness and scalability, the present protocol is immune to dephasing and can be further applied to quantum repeaters and distributed quantum computation.

PMID:
24515161
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