Characterizing the width of entanglement
Characterizing the width of entanglement
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DOI：
10.1088/1367-2630/aa5015
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发表时间：
2016-12
影响因子：
3.3
通讯作者：
S. Wölk;O. Gühne
中科院分区：
文献类型：
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作者：
S. Wölk;O. Gühne
近年来，可控量子系统的规模不断扩大。因此，空间自由度在实验量子系统中变得越来越重要。然而，到目前为止，对多体系统纠缠的研究主要集中在纠缠粒子的个数上，而忽略了空间自由度。其结果是，描述纠缠的空间分布的一般概念和可实验实现的标准一直缺失。我们通过引入纠缠宽度的概念来衡量多体系统中纠缠的空间分布，从而缩小了这一差距。我们提出了仅基于全局可观测性来检测纠缠宽度的标准。因此，我们的纠缠判据可以很容易地应用于多体系统，因为不需要单粒子寻址。
The size of controllable quantum systems has grown in recent times. Therefore, the spatial degree of freedom becomes more and more important in experimental quantum systems. However, the investigation of entanglement in many-body systems mainly concentrated on the number of entangled particles and ignored the spatial degree of freedom so far. As a consequence, a general concept together with experimentally realizable criteria has been missing to describe the spatial distribution of entanglement. We close this gap by introducing the concept of entanglement width as measure of the spatial distribution of entanglement in many-body systems. We develop criteria to detect the width of entanglement based solely on global observables. As a result, our entanglement criteria can be applied easily to many-body systems since single-particle addressing is not necessary.