发表机构
VIT-AP University; Università di Bari; INFN, Sezione di Bari; Université de Lorraine（维特-阿普拉大学; 巴里大学; 意大利国家核物理研究所巴里分部; 洛林大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过连续零差监测两个量子比特，利用碰撞模型推导随机主方程，证明该监测能产生纠缠并增强量子魔力，且资源可通过光学相位调节。
AI 中文摘要
连续弱测量量子系统在量子基础和量子应用中具有重大意义。这种测量可以通过反复测量与目标量子系统弱耦合的辅助系统来实现。本文研究了两个量子比特在不同位置耦合到一个公共的一维电磁场，并通过零差检测在右向和左向传播的输出通道中同时监测它们。利用碰撞模型描述，我们推导了一个解析的随机主方程（SME），该方程控制所产生的扩散量子轨迹，包括两个测量通道之间的干涉。对于量子态的非线性函数，如熵，量子轨迹的平均值通常不同于在无条件态上评估的相应量。通过这一机制，我们展示了连续监测能够产生纠缠（这在无条件动力学中是不存在的），并在衰减过程中增强量子比特对中的量子魔力。这两种资源可以通过量子比特之间累积的光学相位以及零差本地振荡器的相位进行调节。我们的结果确立了多个发射器的连续零差监测作为一种可调的量子资源产生机制。
英文摘要
Continuous weak measurements of quantum systems are of great relevance in quantum foundations and applications. They can be achieved by probing the quantum system of interest by repeatedly measuring an auxiliary system weakly coupled to it. Here we study two qubits coupled in different points to a common one-dimensional electromagnetic field and simultaneously monitored in the right- and left-propagating output channels by homodyne detection. Using a collision-model description, we derive an analytical Stochastic Master Equation (SME) governing the resulting diffusive quantum trajectories, including the interference between the two measurement channels. For nonlinear functions of the quantum state, such as entropies, averages over quantum trajectories generally differ from the corresponding quantities evaluated on the unconditional state. Through this mechanism, we show that continuous monitoring generates entanglement, absent in the unconditional dynamics, and enhances quantum magic in the qubit pair during the decay. Both resources can be tuned through the optical phase accumulated between the qubits and the phases of homodyne local oscillators. Our results establish continuous homodyne monitoring of multiple emitters as a tunable mechanism for generating quantum resources.
