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Science 27 February 2009:
Vol. 323. no. 5918, p. 1169
DOI: 10.1126/science.1168459
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Technical Comments

Response to Comment on "Multipartite Entanglement Among Single Spins in Diamond"

P. Neumann,1*{dagger} 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

Our study reported entanglement among single spins in diamond. Lovett and Benjamin argue that three of six described entangled states were not achieved. Here, we explain our choice of entangled states and discuss their importance for quantum information processing. We also show that the eigenstates discussed by Lovett and Benjamin, although formally entangled and routinely generated in our experiments, cannot be used to detect nonlocal correlations.

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: p.neumann{at}physik.uni-stuttgart.de

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Science. ISSN 0036-8075 (print), 1095-9203 (online)