近日，贵州师范大学贺启亮团队研究了具有反向旋转波项的二量子比特和三量子比特耗散系统之间的非局域性转移。相关论文于2025年4月7日发表在《物理评论A》杂志上。

研究组通过采用数值层次运动方程方法，研究了反旋转波项对耦合到公共槽的三个量子比特的非局域性和纠缠的影响，这些量子比特用于强耦合和超强耦合状态，超出了传统的玻恩-马尔可夫、微扰和旋转波近似处理。

该研究发现如下：（1）在强耦合状态下，反向旋转项加速了真正的三方相关性的衰减，并发现贝尔非局域性的明显突然诞生。（2） 在超强耦合状态下观察到一种现象，即非局域性在三量子比特系统及其子系统之间持续传递。此外，包含反向旋转波项明显增强了真正的三方非局域性。（3） 这些反向旋转项在零激发情况下不能有效地产生真正的三方相关性，这与之前仅涉及两个量子比特的研究不同。（4） 观察到由于反向旋转波项，三方和两方系统的稳态相关性显著降低，这在旋转波近似下是无法检测到的。

附：英文原文

Title: Transfer of nonlocality between two- and three-qubit dissipative systems with counter-rotating-wave terms

Author: Zi-Yu Xiong, Yong-Jun Xiao, Ye-Qi Zhang, Qi-Liang He

Issue&Volume: 2025/04/07

Abstract: We investigate the effect of counter-rotating-wave terms on nonlocality and entanglement for three qubits coupled to a common bath for strong- and ultrastrong-coupling regimes beyond the traditional treatment of Born-Markovian, perturbative, and rotating-wave approximations by employing the numerical hierarchical equations-of-motion approach. Our findings are as follows: (1) In the strong-coupling regime, the counter-rotating terms accelerate the decay of genuine three-party correlations, and the obvious sudden birth of Bell nonlocality is found. (2) In the ultrastrong-coupling regime, we observe a phenomenon in which nonlocality is consistently transferred between a three-qubit system and its subsystem. In addition, the inclusion of counter-rotating wave terms obviously enhances genuine tripartite nonlocality. (3) These counter-rotating terms cannot effectively generate genuine three-party correlations in zero-excitation cases, which differs from previous studies involving only two qubits. (4) A significant reduction in steady-state correlations for three- and two-party systems due to counter-rotating-wave terms is observed, which is not detectable under the rotating-wave approximation.

DOI: 10.1103/PhysRevA.111.042410

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.111.042410