Quantum non-demolition measurement based on an SU(1,1)-SU(2)-concatenated atom-light hybrid interferometer

作     者：Gao-Feng Jiao Keye Zhang L.Q.Chen Chun-Hua Yuan Weiping Zhang GAO-FENG JIAO;KEYE ZHANG;L.Q.CHEN;CHUN-HUA YUAN;WEIPING ZHANG

作者机构：State Key Laboratory of Precision SpectroscopyQuantum Institute for Light and AtomsDepartment of PhysicsEast China Normal UniversityShanghai 200062China School of Physics and Astronomyand Tsung-Dao Lee InstituteShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum SciencesShanghai 201315China Collaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2022年第10卷第2期

页      面：475-482页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：National Key Research and Development Program of China(2016YFA0302001) National Natural Science Foundation of China(11974111,11874152,91536114,11574086,11974116,11654005) Shanghai Rising-Star Program(16QA1401600) Innovation Program of Shanghai Municipal Education Commission(202101070008E00099) Shanghai Talent Program Chinese National Youth Talent Support Program Fundamental Research Funds for the Central Universities 

主　　题：effect quantum wave 

摘      要：Quantum non-demolition(QND) measurement is an important tool in the fields of quantum information processing and quantum optics. The atom-light hybrid interferometer is of great interest due to its combination of an atomic spin wave and an optical wave, which can be utilized for photon number QND measurement via the AC-Stark effect. In this paper, we present an SU(1,1)-SU(2)-concatenated atom-light hybrid interferometer, and theoretically study QND measurement of the photon number. Compared to the traditional SU(2) interferometer,the signal-to-noise ratio in a balanced case is improved by a gain factor of the nonlinear Raman process(NRP)in this proposed interferometer. Furthermore, the condition of high-quality QND measurement is analyzed. In the presence of losses, the measurement quality is reduced. We can adjust the gain parameter of the NRP in the readout stage to reduce the impact due to losses. Moreover, this scheme is a multiarm interferometer, which has the potential of multiparameter estimation with many important applications in the detection of vector fields,quantum imaging, and so on.