非互易耦合诱导光机械系统中的非厄米纠缠
Nonreciprocal Coupling Induced Non-Hermitian Entanglement in Optomechanical Systems
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中文总结 AI 辅助
本文研究非厄米光机械系统中奇异点对纠缠的增强作用，并通过旋转谐振器实现经典与量子非互易性的切换。
中文摘要 AI 辅助
量子纠缠是量子力学最基本的性质之一，是量子信息的关键资源。奇异点（EPs）是非厄米系统中的特殊相变点。非互易性通过打破互易对称性实现单向运动。然而，量子纠缠、奇异点和非互易性之间的联系在非厄米系统中尚未被探索。本文基于一个与两个瑞利散射体耦合的回音壁模式（WGM）谐振器，研究了两个反向传播光学模式之间的非厄米耦合对光机械纠缠的调控。通过控制两个纳米颗粒之间的相对角度，奇异点可以周期性出现。此外，旋转谐振器可以在两个反向传播光学模式中诱导相反的频移。纠缠的对数负性在奇异点处达到最大值，从而显著增强光机械纠缠。相反，在非奇异点处纠缠受到抑制，但可以通过萨尼亚克-斐索频移恢复。特别地，通过在奇异点处驱动谐振器并以最佳旋转速度旋转，我们实现了经典和量子非互易性之间的切换。
英文摘要
Quantum entanglement, one of the most intrinsic properties of quantum mechanics, corresponds to a key resource for quantum information. Exceptional points (EPs) are special phase transition points in non-Hermitian systems. Nonreciprocity achieves one-way motion by breaking reciprocal symmetries. However, the connections among quantum entanglement, EPs, and nonreciprocity remain unexplored in non-Hermitian systems. In this paper, we investigate the manipulation of optomechanical entanglement by non-Hermitian coupling between two counter-propagating optical modes based on a whispering-gallery-mode (WGM) resonator coupled with two Rayleigh scatterers. EPs can periodically appear by controlling the relative angle between two nanoparticles. Moreover, the spinning resonator can induce opposite frequency shifts in two counter-propagating optical modes. The logarithmic negativity of entanglement reaches the maximum at EPs, leading to significant enhancement of optomechanical entanglement. In contrast, the entanglement is suppressed at non-EPs but can be recovered by the Sagnac-Fizeau shift. Specially, by driving the resonator at EPs while spinning it at the optimal rotation speed, we achieve switching between classical and quantum nonreciprocity.
发表机构
- Northeast Normal University（东北师范大学）
- University of Science and Technology of China（中国科学技术大学）
- RIKEN Center for Quantum Computing (RQC)（理化学研究所量子计算中心）
- Shangrao Normal University（上饶师范学院）
机构由 AI 辅助整理，请以论文原文为准。
