摘要
We have theoretically and experimentally studied the dispersive signal of the Rydberg atomic electromagneticallyinduced transparency(EIT)Autler–Townes(AT)splitting spectra obtained using amplitude modulation of the microwave(MW)electric field.In addition to the two zero-crossing points interval△f_(zeros),the dispersion signal has two positive maxima with an interval defined as the shoulder interval△f_(sho),which is theoretically expected to be used to measure a much weaker MW electric field.The relationship of the MW field strength E_(MW)and△f_(sho)is experimentally studied at the MW frequencies of 31.6 GHz and 9.2 GHz respectively.The results show that△f_(sho)can be used to characterize the much weaker E_(MW)than that of△f_(zeros)and the traditional EIT–AT splitting interval△f_(m);the minimum E_(MW)measured by△f_(sho)is about 30 times smaller than that by△f_(m).As an example,the minimum E_(MW)at 9.2 GHz that can be characterized by△f_(sho)is 0.056 mV/cm,which is the minimum value characterized by the frequency interval using a vapor cell without adding any auxiliary fields.The proposed method can improve the weak limit and sensitivity of E_(MW)measured by the spectral frequency interval,which is important in the direct measurement of weak E_(MW).
作者
郝建海
贾凤东
崔越
王昱寒
周飞
刘修彬
张剑
谢锋
白金海
尤建琦
王宇
钟志萍
Jian-Hai Hao;Feng-Dong Jia;Yue Cui;Yu-Han Wang;Fei Zhou;Xiu-Bin Liu;Jian Zhang;Feng Xie;Jin-Hai Bai;Jian-Qi You;Yu Wang;Zhi-Ping Zhong(School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Nuclear and New Energy Technology,Collaborative Innovation Center of Advanced Nuclear Energy Technology,Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education,Tsinghua University,Beijing 100084,China;Science and Technology on Metrology and Calibration Laboratory,Changcheng Institute of Metrology & Measurement,Aviation Industry Corporation of China,Beijing 100095,China;CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190,China)
基金
Project supported by Beijing Natural Science Foundation(Grant No.1212014)
the National Key Research and Development Program of China(Grant Nos.2017YFA0304900 and 2017YFA0402300)
the National Natural Science Foundation of China(Grant Nos.11604334,11604177,and U2031125)
the Key Research Program of the Chinese Academy of Sciences(Grant No.XDPB08-3)
the Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics(Grant No.KF201807)
the Fundamental Research Funds for the Central Universities
Youth Innovation Promotion Association CAS。