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arxiv: 1403.4542 · v2 · pith:V2L5X2YHnew · submitted 2014-03-18 · 🪐 quant-ph · cond-mat.quant-gas

Detecting multiparticle entanglement of Dicke states

Bernd L\"ucke , Jan Peise , Giuseppe Vitagliano , Jan Arlt , Luis Santos , Geza Toth , Carsten Klempt This is my paper
classification 🪐 quant-ph cond-mat.quant-gas
keywords entanglementspinstatescriteriondickeentangledamountapplies
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Recent experiments demonstrate the production of many thousands of neutral atoms entangled in their spin degrees of freedom. We present a criterion for estimating the amount of entanglement based on a measurement of the global spin. It outperforms previous criteria and applies to a wide class of entangled states, including Dicke states. Experimentally, we produce a Dicke-like state using spin dynamics in a Bose-Einstein condensate. Our criterion proves that it contains at least genuine 28-particle entanglement. We infer a generalized squeezing parameter of -11.4(5) dB.

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