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Science 6 June 2008:
Vol. 320. no. 5881, pp. 1326 - 1329
DOI: 10.1126/science.1157233
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Reports

Multipartite Entanglement Among Single Spins in Diamond

P. Neumann,1* N. Mizuochi,2* F. Rempp,1 P. Hemmer,3 H. Watanabe,4 S. Yamasaki,5 V. Jacques,1 T. Gaebel,1 F. Jelezko,1 J. Wrachtrup1{dagger}

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.

1 3.Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany.
2 Graduate School of Library, Information and Media Studies, University of Tsukuba, 1-2 Kasuga, Tsukuba-City, Ibaraki 305-8550, Japan.
3 Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX 77843, USA.
4 Diamond Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, Tsukuba, 305-8568, Japan.
5 Nanotechnology Research Institute AIST, Tsukuba Central 2, Tsukuba, 305-8568, Japan.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: wrachtrup{at}physik.uni-stuttgart.de

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Repetitive Readout of a Single Electronic Spin via Quantum Logic with Nuclear Spin Ancillae.
L. Jiang, J. S. Hodges, J. R. Maze, P. Maurer, J. M. Taylor, D. G. Cory, P. R. Hemmer, R. L. Walsworth, A. Yacoby, A. S. Zibrov, et al. (2009)
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Isotopic Homojunction Band Engineering from Diamond.
H. Watanabe, C. E. Nebel, and S. Shikata (2009)
Science 324, 1425-1428
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Comment on "Multipartite Entanglement Among Single Spins in Diamond".
B. W. Lovett and S. C. Benjamin (2009)
Science 323, 1169c
   Abstract »    Full Text »    PDF »
Response to Comment on "Multipartite Entanglement Among Single Spins in Diamond".
P. Neumann, N. Mizuochi, F. Rempp, P. Hemmer, H. Watanabe, S. Yamasaki, V. Jacques, T. Gaebel, F. Jelezko, and J. Wrachtrup (2009)
Science 323, 1169d
   Abstract »    Full Text »    PDF »


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