Detecting Multiparticle Entanglement of Dicke States
Detecting Multiparticle Entanglement of Dicke States
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DOI：
10.1103/physrevlett.112.155304
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发表时间：
2014-04-17
影响因子：
8.6
通讯作者：
Klempt, Carsten
中科院分区：
文献类型：
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作者：
Luecke, Bernd;Peise, Jan;Klempt, Carsten
最近的实验表明，成千上万的中性原子在它们的自旋自由度中纠缠在一起。我们提出了一个基于测量全局自旋来估计纠缠量的标准。它优于以前的标准，适用于更广泛的纠缠态，包括迪克态。实验上，我们利用玻色-爱因斯坦凝聚体中的自旋动力学产生了一个迪克态。我们的判据证明它至少包含真正的28粒子纠缠。我们推断出一个广义的压缩参数为- 11:4 (5)dB。
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 wider 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.