AI 中文总结
研究通过实验在2.7 - 20GHz宽频范围实现超100MHz瞬时带宽及数百nV cm⁻¹ Hz⁻¹/²灵敏度，利用缀饰态相干和干涉效应拓宽带宽，为里德堡微波传感器在雷达和无线通信等领域实际应用奠定基础。
AI 中文摘要
近年来，里德堡原子作为一种新型微波传感平台备受关注，因其具有独特物理特性：里德堡能级间大跃迁偶极矩和宽频率覆盖。瞬时带宽作为里德堡微波传感器关键指标，此前研究限于单频操作，典型值仅几十兆赫兹。本文通过实验在2.7 - 20GHz宽频范围内实现超100MHz瞬时带宽，灵敏度达数百nV cm⁻¹ Hz⁻¹/²，其物理机制是缀饰态相干和不同跃迁通道间干涉效应。该工作大幅拓宽里德堡微波传感器瞬时带宽，为其在雷达和无线通信等领域实际应用铺平道路。
英文摘要
Rydberg atoms have attracted considerable attention in recent years as a novel platform for microwave sensing, owing to their unique physical merits: large transition dipole moments between Rydberg levels and broad frequency coverage. As a critical figure of merit for Rydberg microwave sensors, instantaneous bandwidth serves as a key benchmark for evaluating their viability in practical applications. Previous studies on instantaneous bandwidth remain limited to single-frequency operation, with typical demonstrated values of only tens of megahertz, a constraint that hampers the real-world deployment of this sensing technology. Here, we experimentally achieve an instantaneous bandwidth of over 100$\,$MHz across a broad frequency range of 2.7-20$\,$GHz and realize a sensitivity in the hundreds of nV$\,$cm$^{-1}\,$Hz$^{-1/2}$ range. The physical mechanism lies in the dressed-state coherence and the interference effect between different transition channels. Our work substantially broadens the instantaneous bandwidth of Rydberg microwave sensors and paves the way for their practical deployment in fields such as radar and wireless communications.
Comments6 pages, 5 figures
