Detecting multiparticle entanglement of Dicke states

Lücke, B. and Peise, J. and Vitagliano, G. and Arlt, J. and Santos, L. and Tóth, Géza and Klempt, C. (2014) Detecting multiparticle entanglement of Dicke states. PHYSICAL REVIEW LETTERS, 112 (15). ISSN 0031-9007

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Abstract

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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