Departamento de Física Aplicada II, Universidad de Sevilla, E-41012 Sevilla, Spain.
Phys Rev Lett. 2015 Jun 5;114(22):220402. doi: 10.1103/PhysRevLett.114.220402. Epub 2015 Jun 4.
Quantum n-body correlations cannot be explained with (n-1)-body nonlocality. However, this genuine n-body nonlocality cannot surpass certain bounds. Here we address the problem of identifying the principles responsible for these bounds. We show that, for any n≥2, the exclusivity principle, as derived from axioms about sharp measurements, and a technical assumption give the exact bounds predicted by quantum theory. This provides a unified explanation of the bounds of single-body contextuality and n-body nonlocality, and connects two programs towards understanding quantum theory.
量子 n 体相关性不能用（n-1）体非局域性来解释。然而，这种真正的 n 体非局域性不能超过某些界限。在这里，我们解决了确定这些界限的原理的问题。我们表明，对于任何 n≥2，从关于尖锐测量的公理中推导出的排他性原理和一个技术假设给出了量子理论所预测的精确界限。这为单物体语境性和 n 体非局域性的界限提供了一个统一的解释，并连接了两个理解量子理论的计划。
