ICFO-Institut de Ciències Fotòniques, Avenida Carl Friedrich Gauss, 3, 08860 Castelldefels, Barcelona, Spain.
Institute for Nuclear Research, Hungarian Academy of Sciences, H-4001 Debrecen, Post Office Box 51, Hungary.
Science. 2014 Jun 13;344(6189):1256-8. doi: 10.1126/science.1247715.
Intensive studies of entanglement properties have proven essential for our understanding of quantum many-body systems. In contrast, much less is known about the role of quantum nonlocality in these systems because the available multipartite Bell inequalities involve correlations among many particles, which are difficult to access experimentally. We constructed multipartite Bell inequalities that involve only two-body correlations and show how they reveal the nonlocality in many-body systems relevant for nuclear and atomic physics. Our inequalities are violated by any number of parties and can be tested by measuring total spin components, opening the way to the experimental detection of many-body nonlocality, for instance with atomic ensembles.
对纠缠特性的深入研究已被证明对我们理解量子多体系统至关重要。相比之下，由于可用的多体贝尔不等式涉及到许多粒子之间的相关性，而这些相关性很难在实验中获得，因此我们对量子非局域性在这些系统中的作用知之甚少。我们构造了仅涉及两体相关性的多体贝尔不等式，并展示了它们如何揭示与核和原子物理相关的多体系统中的非局域性。我们的不等式被任意数量的粒子违反，并且可以通过测量总自旋分量来检验，这为使用原子集合等实验检测多体非局域性开辟了道路。
