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Multipartite Entanglement Among Single Spins in Diamond

Science  06 Jun 2008:
Vol. 320, Issue 5881, pp. 1326-1329
DOI: 10.1126/science.1157233

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Abstract

Robust entanglement at room temperature is a necessary requirement for practical applications in quantum technology. We demonstrate the creation of bipartite- and tripartite-entangled quantum states in a small quantum register consisting of individual 13C nuclei in a diamond lattice. Individual nuclear spins are controlled via their hyperfine coupling to a single electron at a nitrogen-vacancy defect center. Quantum correlations are of high quality and persist on a millisecond time scale even at room temperature, which is adequate for sophisticated quantum operations.

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