发表机构
Beijing Institute of Radio Metrology and Measurement; Science and Technology on Metrology and Calibration Laboratory, Beijing Institute of Radio Metrology and Measurement（北京无线电计量测试研究所; 北京无线电计量测试研究所计量与校准重点实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
提出闭环三模光机械系统，通过相对相位调控实现双体和三体纠缠的确定性切换，并观测到与理想EPR态一致的贝尔不等式最大违背，且发现三体贝尔非定域性可在无真三体纠缠时存续。
AI 中文摘要
我们提出了一种新颖的方案，用于在闭环三模光机械系统中产生和操控双体及三体纠缠和贝尔非定域性。在该系统中，两个光学模式通过典型的光机械相互作用同时耦合到一个机械模式，并通过场传输彼此耦合。这种配置产生了相位敏感耦合，其中相对相位直接控制两个光学模式之间的粒子数分布，从而实现量子关联的相干再分配。通过调节该相对相位，我们实现了两个光学-机械对之间双体纠缠的确定性切换，以及三模之间可调的真三体纠缠。利用位移奇偶测量，我们在相空间中构建了双体和三体贝尔不等式，并观察到最大违背分别约为$2.32$和$3$，这与理想双体和三体爱因斯坦-波多尔斯基-罗森态所能达到的值完全一致。反直觉地，我们发现即使真三体纠缠不存在，三体贝尔非定域性仍可持续存在，这为理解这两类量子关联之间的关系提供了更深入的见解。此外，我们系统地分析了机械耗散和热噪声的影响，确定了在现实实验条件下贝尔违背存活的参数区域。我们的结果为产生、控制和验证多体量子关联建立了一个综合框架，为相位可调量子网络和抗噪声的量子基础检验铺平了道路。
英文摘要
We propose a novel scheme to generate and manipulate bipartite and tripartite entanglement and Bell nonlocality in a closed-loop three-mode optomechanical system, where two optical modes are simultaneously coupled to a mechanical mode via typical optomechanical interactions and also coupled to each other through field transmission. This configuration gives rise to a phase-sensitive coupling, in which the relative phase directly controls the population distribution between two optical modes, enabling coherent redistribution of quantum correlations. By tuning this relative phase, we achieve deterministic switching of bipartite entanglement between two optical-mechanical pairs, as well as tunable genuine tripartite entanglement among three modes. Employing the displaced-parity measurement, we construct both the bipartite and tripartite Bell inequalities in phase space and observe maximal violations of approximately $2.32$ and $3$, respectively, which coincide exactly with the values achievable for ideal bipartite and tripartite Einstein-Podolsky-Rosen states. Counterintuitively, we find that the tripartite Bell nonlocality can persist even when the genuine tripartite entanglement is absent, providing deeper insight into the relationship between these two types of quantum correlations. Furthermore, we systematically analyze the effects of mechanical dissipation and thermal noise, identifying the parameter regions where Bell violation survives under realistic experimental conditions. Our results establish a comprehensive framework for generating, controlling, and verifying multipartite quantum correlations, paving the way towards phase-tunable quantum networks and noise-resilient tests of quantum foundations.
