集体增强型通用光子阻塞
Collectively Enhanced Universal Photon Blockade
AI总结：
该研究在多发射器双光子Tavis–Cummings系统中提出集体增强型通用光子阻塞方案，通过分析其最优条件及性能，实现高亮度、高纯度、可调谐的单光子发射，为相关应用提供可扩展途径。
AI中文摘要：
高纯度、高亮度的单光子源对量子信息处理和精密测量具有重要意义。我们在多发射器双光子Tavis–Cummings系统中提出一种集体增强型通用光子阻塞方案：腔与集体发射器的独立相干驱动可使双光子激发路径间产生相消干涉，而集体耦合则提供能级非谐性。通过全量子主方程模拟、Holstein–Primakoff近似及非厄米概率幅分析，得到最优条件：腔共振及相位、振幅匹配。与纯集体阻塞相比，该方案降低了二阶关联函数g⁽²⁾(0)，且基本保持单光子布居。随发射器数量N增加，最优点始终处于腔失谐Δ_c=0处，最小关联满足g⁽²⁾_min(0)∝N⁻²；相比之下，非常规光子阻塞随N增加会偏离共振，限制了其纯度和亮度提升。在弱驱动区域，通用阻塞因通过三激发态流形的高阶旁路满足g⁽²⁾(0)∝ε_a²，驱动强度因此提供额外的纯度-亮度调控手段，不过干涉机制使该方案对耗散率失配更为敏感。本研究为多发射器腔量子电动力学系统中实现高亮度、高纯度、可调谐的单光子发射建立了可扩展的途径。
英文摘要：
High-purity and bright single-photon sources are important for quantum information processing and precision measurement. We propose a collectively enhanced universal photon-blockade scheme in a multi-emitter two-photon Tavis--Cummings system. Independent coherent drives of the cavity and collective emitter enable destructive interference between two-photon excitation pathways, while collective coupling supplies level anharmonicity. Full-quantum master-equation simulations, the Holstein--Primakoff approximation, and a non-Hermitian probability-amplitude analysis yield the optimal conditions: cavity resonance together with phase and amplitude matching. Compared with a purely collective blockade, the proposed scheme lowers \(g^{(2)}(0)\), and essentially preserves the single-photon population. As the emitter number \(N\) increases, the optimal point remains at \(Δ_c=0\), while the minimum correlation follows \(g_{\min}^{(2)}(0)\propto N^{-2}\). By contrast, unconventional photon blockade shifts away from resonance as \(N\) increases, limiting its purity improvement and brightness. In the weak-drive regime, universal blockade obeys \(g^{(2)}(0)\propto\varepsilon_a^2\), owing to a higher-order bypass through the three-excitation manifold. The drive strength therefore provides an additional purity--brightness control, although the interference mechanism makes the scheme more sensitive to dissipation-rate mismatch. Our results establish a scalable route to bright, high-purity, and tunable single-photon emission in multi-emitter cavity-QED systems.
