发表机构
Sun Yat-Sen University; Shihezi University; Guangdong University of Technology; Ningbo University（中山大学; 石河子大学; 广东工业大学; 宁波大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究提出微波屏蔽极性分子与光学腔耦合平台，利用屏蔽诱导的各向异性相互作用同时实现光子阻塞增强（单光子纯度提升三个数量级）和贝尔态保护，为分子腔QED提供统一相互作用资源。
AI 中文摘要
微波屏蔽最近已成为在超冷极性分子中调控相互作用的有力工具，但其在控制腔量子电动力学方面的潜力在很大程度上仍未得到探索。在此，我们研究了一个分子腔量子电动力学平台，其中两个微波屏蔽的极性分子耦合到单个光学腔模，并证明屏蔽诱导的相互作用为光子阻塞和贝尔态保护提供了统一机制。各向异性相互作用通过增强其非谐性重塑了少激发谱，从而抑制多光子跃迁，并将单光子纯度提高三个数量级以上。增强的阻塞伴随着负纵向自旋相关性的出现，揭示了相互作用诱导的分子同时激发的抑制。我们进一步表明，光子统计对分子的相对构型高度敏感，相对零点涨落尺度上的位置变化会显著改变阻塞性能。在少光子非线性光学之外，相同的相互作用通过将分子激发与有损腔模色散解耦来保护初始制备的分子贝尔态，从而抑制腔介导的耗散并减缓保真度衰减。我们的结果确立了微波屏蔽相互作用作为在分子腔QED系统中工程化少光子非线性和保护量子态的统一相互作用资源。
英文摘要
Microwave shielding has recently emerged as a powerful tool for engineering interactions in ultracold polar molecules, yet its potential for controlling cavity quantum electrodynamics remains largely unexplored. Here, we investigate a molecular cavity quantum electrodynamics platform in which two microwave-shielded polar molecules are coupled to a single optical cavity mode and demonstrate that shielding-induced interactions provide a unified mechanism for both photon blockade and Bell-state protection. The anisotropic interaction reshapes the few-excitation spectrum by enhancing its anharmonicity, thereby suppressing multiphoton transitions and improving the single-photon purity by more than three orders of magnitude. The enhanced blockade is accompanied by the emergence of negative longitudinal spin correlations, revealing the interaction-induced suppression of simultaneous molecular excitations. We further show that the photon statistics are highly sensitive to the relative molecular configuration, with positional variations on the scale of the relative zero-point fluctuation substantially modifying the blockade performance. Beyond few-photon nonlinear optics, the same interaction protects an initially prepared molecular Bell state by dispersively decoupling molecular excitations from the lossy cavity mode, thereby suppressing cavity-mediated dissipation and slowing the fidelity decay. Our results establish microwave-shielded interactions as a unified interaction resource for engineering few-photon nonlinearities and protecting quantum states in molecular cavity-QED systems.
Comments16 pages, 8 figures
