We demonstrate the use of multiple atomic-level Rydberg-atom schemes for continuous frequency detection of radio-frequency (RF) fields. Resonant detection of RF fields by electromagnetically induced transparency and Autler-Townes (AT) splitting in Rydberg atoms is typically limited to frequencies within the narrow bandwidth of a Rydberg transition. By applying a second field resonant with an adjacent Rydberg transition, far-detuned fields can be detected through a two-photon resonance AT splitting. This two-photon AT splitting method is several orders of magnitude more sensitive than off-resonant detection using the Stark shift. We present the results of various experimental configurations and a theoretical analysis to illustrate the effectiveness of this multiple level scheme. These results show that this approach allows for the detection of frequencies in a continuous band between resonances with adjacent Rydberg states.

中文翻译：

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通过相邻里德堡共振调谐进行连续射频电场检测

我们演示了使用多个原子级里德堡原子方案对射频 (RF) 场进行连续频率检测。通过电磁感应透明度和里德堡原子中的 Autler-Townes (AT) 分裂对 RF 场的共振检测通常限于里德堡跃迁的窄带宽内的频率。通过应用具有相邻里德堡跃迁的第二场共振，可以通过双光子共振 AT 分裂来检测远失谐场。这种双光子 AT 分裂方法比使用斯塔克位移的偏共振检测灵敏几个数量级。我们展示了各种实验配置的结果和理论分析，以说明这种多级方案的有效性。