基于Floquet边带增强的里德伯原子短波电场测量

中文摘要 AI 辅助

里德伯原子电场传感器在光学激发和读出的框架下，能够克服楚（Chu）极限所施加的尺寸-波长约束。然而，对于十米波长的短波电场，其灵敏度远低于微波电场，这源于低频信号与里德伯跃迁的失谐特性。在此，我们展示了一种基于微波缀饰里德伯原子的高灵敏度外差短波传感器，利用精确调制的Floquet边带。在局域场和微波场工程化的Floquet边带附近，通过额外创建的相干通道增强的原子-短波相互作用所产生的陡峭响应梯度，引起了外差中频信号的显著放大。因此，与没有微波调制的相同原子外差装置相比，这种Floquet边带增强的短波测量将灵敏度提升了四个数量级，在30 MHz短波处实现了-122.7 dBm/Hz的灵敏度。这项工作为射电天文学、雷达和远距离通信中的高灵敏度便携式短波接收机提供了一条潜在途径。

英文摘要

Rydberg atomic electric-field sensors, under the framework of optical excitation and readout, can overcome the size-to-wavelength constraint imposed by the Chu limit. However, their sensitivity for decametric-wavelength shortwave electric fields is substantially lower than that for microwave ones, stemming from the off-resonant nature of low-frequency signals with Rydberg transitions. Here, we demonstrate a high-sensitivity heterodyne shortwave sensor based on microwave-dressed Rydberg atoms, leveraging precisely modulated Floquet sidebands. Around local- and microwave-field-engineered Floquet sidebands, the steep response gradient, arising from the enhanced atom-shortwave interaction through additionally created coherent channels, induces pronounced amplification of the heterodyne intermediate-frequency signal. As a result, compared to the same atomic heterodyne setup without microwave modulation, such Floquet-sideband-enhanced shortwave measurement boosts the sensitivity by four orders of magnitude, yielding a sensitivity of -122.7 dBm/Hz for shortwave at 30 MHz. This work offers a potential route to high-sensitive portable shortwave receivers in radio astronomy, radar and long-distance communications.

发表机构

• Xi’an Jiaotong University（西安交通大学）
• Nanjing University（南京大学）
• Beijing Institute of Radio Metrology and Measurement（北京无线电计量测试研究所）
• East China Normal University（华东师范大学）
• Hefei National Laboratory（合肥国家实验室）
• University of Arkansas（阿肯色大学）

机构由 AI 辅助整理，请以论文原文为准。