Multipartite Entanglement Among Single Spins in Diamond

@article{Neumann2008MultipartiteEA,
  title={Multipartite Entanglement Among Single Spins in Diamond},
  author={Philipp Neumann and Norikazu Mizuochi and Florian Rempp and Philip Robert Hemmer and Hikaru Watanabe and Satoshi Yamasaki and Vincent Jacques and Torsten Gaebel and Fedor Jelezko and J{\"o}rg Wrachtrup},
  journal={Science},
  year={2008},
  volume={320},
  pages={1326 - 1329}
}
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… 

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Comment on "Multipartite Entanglement Among Single Spins in Diamond"

Two of the system's nuclear eigenstates are incorrectly described as product states when they are inherently entangled, and three of the six states reported, namely the odd-parity Bell states and the W state, were not actually produced.

Performance of quantum registers in diamond in the presence of spin impurities

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