Precise measurement of a weak radio frequency electric field using a resonant atomic probe
Precise measurement of a weak radio frequency electric field using a resonant atomic probe
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使用共振原子探针精确测量弱射频电场
DOI：
10.1088/1674-1056/ab6c49
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发表时间：
2020
影响因子：
1.7
通讯作者：
Zhao Jianming
中科院分区：
文献类型：
--
作者：
Hao Liping;Xue Yongmei;Fan Jiabei;Bai Jingxu;Jiao Yuechun;Zhao Jianming
利用共振原子探针对频率为1.3GHz的射频弱电场进行了精确测量，该探针由一个包含铯原子基态的里德堡级联三能级原子构成|6S 1/2 π，激发态|6P 3/2 π态和里德伯态|nD 5/2 mm。两个射频（RF）电场，称为本地和信号场，耦合附近的里德伯跃迁。利用双光子共振里德伯电磁感应透明（Rydberg-EIT）技术，直接读出被微波修饰的共振里德伯原子中编码的局域场与信号场相差数百kHz的弱信号场。在2.18GHz耦合时，最小可探测信号场E S min= 1.36± 0.04mV/m| 68 D 5/2毫米→| 69 P 3/2 π跃迁和1.33±0.02 mV/m（1.32 GHz耦合）|80 D 5/2英寸→| 81 P3/2跃迁。通过改变信号场频率，还研究了带宽依赖性，并获得了3 MHz的相应− 3 dB带宽。该方法可用于快速、精确地测量弱电场，对原子微波计量具有重要意义。
We present a precise measurement of a weak radio frequency electric field with a frequency of≲ 3 GHz employing a resonant atomic probe that is constituted with a Rydberg cascade three-level atom, including a cesium ground state| 6S 1/2⟩, an excited state| 6P 3/2⟩, and Rydberg state| nD 5/2⟩. Two radio frequency (RF) electric fields, noted as local and signal fields, couple the nearby Rydberg transition. The two-photon resonant Rydberg electromagnetically induced transparency (Rydberg-EIT) is employed to directly read out the weak signal field having hundreds of kHz difference between the local and signal fields that is encoded in the resonant microwave-dressed Rydberg atoms. The minimum detectable signal fields of E S min= 1.36±0.04 mV/m for 2.18 GHz coupling| 68D 5/2⟩→| 69P 3/2⟩ transition and 1.33±0.02 mV/m for 1.32 GHz coupling| 80D 5/2⟩→| 81P 3/2⟩ transition are obtained, respectively. The bandwidth dependence is also investigated by varying the signal field frequency and corresponding− 3 dB bandwidth of 3 MHz is attained. This method can be employed to perform a rapid and precise measurement of the weak electric field, which is important for the atom-based microwave metrology.