波导耦合单原子实现高效双光子产生
Efficient biphoton generation by a waveguide-coupled single atom
- Northeast Normal University（东北师范大学）
- Brescia University（布雷西亚大学）
- Scuola Normale Superiore（意大利高等师范学院）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究利用波导耦合单原子的自发四波混频，在无需损耗抑制或严格相位匹配的条件下实现高效双光子产生，其双光子源满足下一代片上量子光源的关键要求。
AI中文摘要：
手性波导附近经历自发四波混频的单原子，可将发射的斯托克斯-反斯托克斯光子对高效耦合到两个紧密受限的波导模式中，从而在无需损耗抑制或严格相位匹配的情况下实现增强的双光子产生。我们开发了一种微扰处理方法，适用于实验现实条件下的四能级原子系统，以解释这种增强的物理起源并明确相关约束，这些约束由原子向导模和非导模的衰减率相互作用决定。除了达到与自由空间中数百微米长的冷原子系综相当的最佳产生率外，我们的双光子源还自然满足下一代片上量子光源的关键要求，即低损耗运行、鲁棒性、紧凑性和可扩展性。
英文摘要：
A single atom undergoing spontaneous four-wave mixing near a chiral waveguide can efficiently channel an emitted Stokes-anti-Stokes photon pair into two tightly confined waveguide modes, yielding thus enhanced biphoton generation without requiring loss suppression or stringent phase matching. We develop a perturbative treatment, valid for a four-level atomic system under experimentally realistic conditions, to explain physical origins and clarify relevant constraints of such an enhancement determined by the interplay of atomic decay rates toward guided and unguided modes. Besides achieving optimal generation rates equivalent to a cold atomic ensemble hundreds of micrometers long in free space, our biphoton source naturally fulfills key requirements for next-generation on-chip quantum light sources, namely low-loss operation, robustness, compactness, and scalability.
