Li Yanna, Gessner Manuel, Li Weidong, Smerzi Augusto
Institute of Theoretical Physics and Department of Physics, State Key Laboratory of Quantum Optics and Quantum Optics Devices, Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China.
QSTAR, INO-CNR and LENS, Largo Enrico Fermi 2, I-50125 Firenze, Italy.
Phys Rev Lett. 2018 Feb 2;120(5):050404. doi: 10.1103/PhysRevLett.120.050404.
The controlled generation and identification of quantum correlations, usually encoded in either qubits or continuous degrees of freedom, builds the foundation of quantum information science. Recently, more sophisticated approaches, involving a combination of two distinct degrees of freedom, have been proposed to improve on the traditional strategies. Hyperentanglement describes simultaneous entanglement in more than one distinct degree of freedom, whereas hybrid entanglement refers to entanglement shared between a discrete and a continuous degree of freedom. In this work we propose a scheme that allows us to combine the two approaches, and to extend them to the strongest form of quantum correlations. Specifically, we show how two identical, initially separated particles can be manipulated to produce Bell nonlocality among their spins, among their momenta, as well as across their spins and momenta. We discuss possible experimental realizations with atomic and photonic systems.
量子关联的可控生成与识别通常编码于量子比特或连续自由度中，构成了量子信息科学的基础。近来，为改进传统策略，人们提出了更为复杂的方法，涉及两种不同自由度的组合。超纠缠描述的是在不止一个不同自由度中的同时纠缠，而混合纠缠指的是离散自由度与连续自由度之间共享的纠缠。在这项工作中，我们提出了一种方案，它能让我们将这两种方法结合起来，并将它们扩展到最强形式的量子关联。具体而言，我们展示了如何操纵两个最初分离的相同粒子，以在其自旋之间、动量之间以及跨越其自旋和动量产生贝尔非定域性。我们讨论了使用原子和光子系统的可能实验实现方式。
