Centre for Engineered Quantum Systems, School of Mathematics and Physics, University of Queensland, 4072 Brisbane, QLD, Australia.
Phys Rev Lett. 2011 May 20;106(20):200402. doi: 10.1103/PhysRevLett.106.200402.
Tests such as Bell's inequality and Hardy's paradox show that joint probabilities and correlations between distant particles in quantum mechanics are inconsistent with local realistic theories. Here we experimentally demonstrate these concepts in the time domain, using a photonic entangling gate to perform nondestructive measurements on a single photon at different times. We show that Hardy's paradox is much stronger in time and demonstrate the violation of a temporal Bell inequality independent of the quantum state, including for fully mixed states.
测试，如贝尔不等式和哈迪悖论，表明在量子力学中，遥远粒子之间的联合概率和相关性与局部实在论理论不一致。在这里，我们在时域中实验性地证明了这些概念，使用光子纠缠门在不同时间对单个光子进行非破坏性测量。我们表明，哈迪悖论在时间上要强得多，并证明了违反时间贝尔不等式的情况，与量子态无关，包括完全混合态。
