论文标题
通过连贯的量子反馈增强自发纠缠产生
Enhancement of spontaneous entanglement generation via coherent quantum feedback
论文作者
论文摘要
我们研究了由半芬纳，一维光子波导介导的两个两级发射器（Qubits）的纠缠动力学。每个量子与波导的耦合是手性，取决于光的传播方向。波导的有限端由完美的镜子终止，因此将连贯的量子反馈引入系统。我们表明，可以通过控制反馈的时间延迟来保留Qubits之间的手性生成的纠缠。此外，当时间延迟可以忽略不计时，Qubit Qubit降低的系统在强耦合方面内会演变，并且Qubits几乎可以最大地纠缠。我们还分析了协议与某些相关参数变化的鲁棒性。
We investigate the entanglement dynamics of two two-level emitters (qubits) mediated by a semiinfinite, one-dimensional (1D) photonic waveguide. The coupling of each qubit to the waveguide is chiral, which depends on the propagation direction of light. The finite end of the waveguide is terminated by a perfect mirror, such that coherent quantum feedback is introduced to the system. We show that the chirally generated entanglement between the qubits can be preserved by controlling the time delay of the feedback. Moreover, when the time delay is negligible, the qubit-qubit reduced system evolves within the strong-coupling regime and the qubits can be almost maximally entangled. We also analyze the robustness of the protocol against variations of some relevant parameters.
