arXiv 2007.138052020-07quant-ph

玻色-爱因斯坦凝聚体中的自旋-动量纠缠

Spin-momentum entanglement in a Bose-Einstein condensate

Sumit Suresh Kale, Yijue Ding, Yong P. Chen, Bretislav Friedrich, Sabre Kais

发表信息：: Physical Chemistry Chemical Physics, 2020
DOI：: 10.1039/D0CP03945D

摘要：

纠缠是量子信息处理的核心，并且可能被证明是量子加速的必要条件。受超冷原子系统中自旋-动量耦合的理论和实验研究的启发，我们研究了$^{87}$ Rb原子光学囚禁BEC中自旋自由度和动量自由度之间的纠缠.我们认为纠缠，由于这些自由度的拉曼和射频场引起的耦合，并检查其依赖于耦合参数的评估冯诺伊曼熵以及并发作为措施的纠缠达到。我们的计算表明，在适当的实验条件下，可以获得显着的自旋动量纠缠，冯诺伊曼熵的80%的最大可达到的值。我们的分析为BEC在量子信息中的应用提供了一些启示。

英文摘要：

Entanglement is at the core of quantum information processing and may prove essential for quantum speed-up. Inspired by both theoretical and experimental studies of spin-momentum coupling in systems of ultra-cold atoms, we investigate the entanglement between the spin and momentum degrees of freedom of an optically trapped BEC of $^{87}$Rb atoms. We consider entanglement that arises due to the coupling of these degrees of freedom induced by Raman and radio-frequency fields and examine its dependence on the coupling parameters by evaluating von Neumann entropy as well as concurrence as measures of the entanglement attained. Our calculations reveal that under proper experimental conditions significant spin-momentum entanglement can be obtained, with von Neumann entropy of 80% of the maximum attainable value. Our analysis sheds some light on the prospects of using BECs for quantum information applications.

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