两个耦合SQUID环在量子到经典跃迁中的持续纠缠--量子跳跃方法
Persistent entanglement in two coupled SQUID rings in the quantum to classical transition - A quantum jumps approach
摘要：
我们探讨了两个耦合的、相同的超导量子干涉器件（SQUID）环的量子-经典交叉。这项工作的动机是基于最近的一系列论文。在文献[1]中，我们证明了Duffing振子的混沌解和周期（夹带）解的纠缠特性有很大的不同，而经典极限纠缠只在类混沌解中保持。然而，Duffing振荡器是一个高度理想化的玩具系统。出于探索更多实验上可实现的系统的愿望，我们将[2，3]中的工作扩展到SQUID环的分析。在[3]中，我们证明了这两个系统有一个共同的特征。也就是说，当SQUID环的轨道似乎遵循（半）经典轨道时，纠缠仍然存在。我们在[3]中的分析仅限于主方程的量子态扩散解开-代表单位效率外差检测（或双向正交零差检测）。在这里，我们表明，非常相似的行为发生使用量子跳跃解开主方程。量子跃迁代表了一个不连续的光子计数测量过程。因此，这里给出的结果意味着这种持续纠缠是独立的测量过程，我们的结果可能是相当普遍的性质。
英文摘要：
We explore the quantum-classical crossover of two coupled, identical, superconducting quantum interference device (SQUID) rings. The motivation for this work is based on a series of recent papers. In ~[1] we showed that the entanglement characteristics of chaotic and periodic (entrained) solutions of the Duffing oscillator differed significantly and that in the classical limit entanglement was preserved only in the chaotic-like solutions. However, Duffing oscillators are a highly idealised toy system. Motivated by a wish to explore more experimentally realisable systems we extended our work in [2,3] to an analysis of SQUID rings. In [3] we showed that the two systems share a common feature. That is, when the SQUID ring's trajectories appear to follow (semi) classical orbits entanglement persists. Our analysis in[3] was restricted to the quantum state diffusion unravelling of the master equation - representing unit efficiency heterodyne detection (or ambi-quadrature homodyne detection). Here we show that very similar behaviour occurs using the quantum jumps unravelling of the master equation. Quantum jumps represents a discontinuous photon counting measurement process. Hence, the results presented here imply that such persistent entanglement is independent of measurement process and that our results may well be quite general in nature.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
