论文标题
光子的量子相干反馈控制
Quantum coherent feedback control with photons
论文作者
论文摘要
本文的目的是研究通过与波导偶联的腔量子电动力学（腔QED）系统的相干反馈控制引起的两光子动力学。在此设置中，腔中的两级系统可以作为光子源起作用，并且发射到波导中的光子可以在波导中传播和反射后多次与空腔 - QED系统重新交互，在此期间，反馈可以调节腔内和腔内的光子的数量。我们在两种情况下分析了此连贯反馈网络中两光子过程的动力学：连续模式耦合方案和波导和空腔之间的离散周期模式耦合方案。这些耦合方案的差异是由于它们的相对尺度和用于耦合的半透明镜子的数量。具体而言，在连续模式耦合方案中，两光子状态的产生受波导的反馈回路的长度以及波导和腔QED系统之间的耦合强度的影响。通过调整波导的长度和耦合强度，我们能够有效地生成两光子状态。在离散的周期模式耦合方案中，腔中的Rabi振荡可以稳定，并且波导中没有明显的两光子状态。
The purpose of this paper is to study two-photon dynamics induced by the coherent feedback control of a cavity quantum electrodynamics (cavity-QED) system coupled to a waveguide. In this set-up, the two-level system in the cavity can work as a photon source, and the photon emitted into the waveguide can re-interact with the cavity-QED system many times after the transmission and reflection in the waveguide, during which the feedback can tune the number of the photons in and out of the cavity. We analyze the dynamics of two-photon processes in this coherent feedback network in two scenarios: the continuous mode coupling scheme and the discrete periodic mode coupling scheme between the waveguide and cavity. The difference of these coupling schemes is due to their relative scales and the number of semi-transparent mirrors for coupling. Specifically, in the continuous mode coupling scheme, the generation of two-photon states is influenced by the length of the feedback loop by the waveguide and the coupling strength between the waveguide and the cavity-QED system. By tuning the length of the waveguide and the coupling strength, we are able to generate two-photon states efficiently. In the discrete periodic mode coupling scheme, the Rabi oscillation in the cavity can be stabilized and there are no notable two-photon states in the waveguide.
