How to entangle nearly 3000 atoms using a single photon

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Here we generate entanglement in a large atomic ensemble via an interaction with a very weak laser pulse; remarkably, the detection of a single photon prepares several thousand atoms in an entangled state...More generally, our results demonstrate the power of heralded methods for entanglement generation, and illustrate how the information contained in a single photon can drastically alter the quantum state of a large system.
Entanglement with negative Wigner function of almost 3,000 atoms heralded by one photon
http://www.nature.com/articles/natu...UwDGWkKbLL&tracking_referrer=physicsworld.com
http://www.sciencedaily.com/releases/2015/03/150325151903.htm
http://physicsworld.com/cws/article...angle-nearly-3000-atoms-using-a-single-photon
 
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DrChinese
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