Spin systems have now been found that have lifetimes of up to six hours. They could be used to build quantum-communication networks and, if optical transmission fails, could even be shipped as a 'quantum memory stick'. See Letter p.177
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Morton, J., Mølmer, K. Spin memories in for the long haul. Nature 517, 153–154 (2015). https://doi.org/10.1038/517153a
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DOI: https://doi.org/10.1038/517153a