Faculty of Physics, University of Warsaw, ulica Pasteura 5, PL-02-093 Warszawa, Poland.
Phys Rev Lett. 2018 Apr 6;120(14):140406. doi: 10.1103/PhysRevLett.120.140406.
We propose an experiment, where the Bell inequality is violated in a many-body system of massive particles. The source of correlated atoms is a spinor F=1 Bose-Einstein condensate residing in an optical lattice. We characterize the complete procedure-the local operations, the measurements, and the inequality-necessary to run the Bell test. We show how the degree of violation of the Bell inequality depends on the strengths of the two-body correlations and on the number of scattered pairs. We show that the system can be used to demonstrate the Einstein-Podolsky-Rosen paradox. Also, the scattered pairs are an excellent many-body resource for the quantum-enhanced metrology. Our results apply to any multimode system where the spin-changing collision drives the scattering into separate regions. The presented inquiry shows that such a system is versatile as it can be used for the tests of nonlocality, quantum metrology, and quantum information.
我们提出了一个实验，在这个实验中，多体系统中的大量粒子违反了贝尔不等式。相关原子的来源是处于光学晶格中的自旋 F=1 玻色-爱因斯坦凝聚态。我们描述了运行贝尔测试所需的完整过程——本地操作、测量和不等式。我们展示了违反贝尔不等式的程度如何取决于双体相关性的强度和散射对的数量。我们表明，该系统可用于演示爱因斯坦-波多尔斯基-罗森悖论。此外，散射对是量子增强计量学的绝佳多体资源。我们的结果适用于任何多模系统，其中改变自旋的碰撞将散射驱动到不同的区域。所提出的探究表明，这样的系统具有多功能性，因为它可用于非局域性测试、量子计量学和量子信息。
