Department of Physics, Stockholm University, S-10691, Stockholm, Sweden.
Phys Rev Lett. 2009 Oct 16;103(16):160405. doi: 10.1103/PhysRevLett.103.160405.
We present an experimental state-independent violation of an inequality for noncontextual theories on single particles. We show that 20 different single-photon states violate an inequality which involves correlations between results of sequential compatible measurements by at least 419 standard deviations. Our results show that, for any physical system, even for a single system, and independent of its state, there is a universal set of tests whose results do not admit a noncontextual interpretation. This sheds new light on the role of quantum mechanics in quantum information processing.
我们展示了一种实验性的、与状态无关的单粒子非定域理论违背，它违反了一个涉及单光子态的序贯相容测量结果之间关联的不等式，违背值至少为 419 个标准差。我们的结果表明，对于任何物理系统，甚至是单个系统，且与其状态无关，都存在一组普遍的测试，其结果不允许非定域解释。这为量子力学在量子信息处理中的作用提供了新的视角。
