论文标题
Bose-Einstein冷凝物中的旋转摩托孔纠缠
Spin-momentum entanglement in a Bose-Einstein condensate
论文作者
论文摘要
纠缠是量子信息处理的核心，可能对量子加速而言至关重要。受到超冷原子系统中自旋摩托耦合的理论和实验研究的启发，我们研究了自旋和动量自由度之间的纠缠，即$^{87} $ rb原子的光学捕获的BEC的自由度。我们考虑由于拉曼和射频场引起的这些自由度的耦合而产生的纠缠，并通过评估von Neumann熵以及作为纠缠所获得的量子的量度来检查其对耦合参数的依赖。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摩托车纠缠，而von Neumann的熵为最大可达到的值的80％。我们的分析阐明了使用BEC用于量子信息应用的前景。
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.
