带时滞相干反馈的非简并参量放大器的EPR型纠缠特性研究
Study of the EPR-type entanglement characteristics of a NDPA with time-delayed coherent feedback
AI总结：
本文研究带时滞相干反馈的阈值以下开放式非简并参量振荡器，发现其可通过延迟反馈动力学实现可调特征频率的EPR型纠缠显著增强，且对相位匹配敏感，在有限额外损耗下仍有效。
摘要：
本文在泵浦未耗尽区域下，研究了工作于阈值以下、带有时滞相干反馈（TDCF）的开放式非简并参量振荡器（NDPO）。研究的品质因数为双模压缩谱，用于衡量输出场中下转换模式之间连续变量爱因斯坦-波多尔斯基-罗森型（EPR型）纠缠的强度。通过探索参数空间的不同区域，发现该系统可实现纠缠的显著增强，且特征频率可调。这类类共振特征与延迟反馈带来的独特动力学特性密切相关。该系统对相位匹配十分敏感，可通过实验装置的多种参数进行调节。本方案的另一优势在于，即便存在有限的额外损耗，仍可实现纠缠的显著增强。
英文摘要：
An open non-degenerate parametric oscillator (NDPO) is studied below threshold in the undepleted pump regime with time-delayed coherent feedback (TDCF). The figure of merit is the two-mode squeezing spectrum measuring the strength of continuous-valued Einstein-Podolsky-Rosen-type (EPR-type) entanglement between the down-converted modes in the output field. Exploring different areas of the parameter space reveals the possibility of significantly enhanced entanglement with tunable characteristic frequency. These resonance-like features are closely related to the unique dynamics emerging as a result of delayed feedback. The system is very sensitive to phase matching, which can be adjusted by various parameters of the setup. Further advantage of the current scheme is that significant enhancement of entanglement can be achieved even with finite extraneous losses.
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