# 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 H. 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…

## 592 Citations

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### Comment on "Multipartite Entanglement Among Single Spins in Diamond"

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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.

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Nitrogen-vacancy (NV) centers in diamond have recently emerged as a unique platform for fundamental studies in quantum information and nanoscience. The special properties of these impurity centers…

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