基于^(87)Sr光晶格钟的时域Landau-Zener-Stückelberg-Majorana干涉边带谱的测量  

Measurement of the time-domain Landau-Zener-Stückelberg-Majorana interference sidebands in an 87Sr optical lattice clock

作　　者：夏京京 刘伟新 周驰华 谭巍 汪涛[5,6] 常宏[1,2,3] XIA Jingjing;LIU Weixin;ZHOU Chihua;TAN Wei;WANG Tao;CHANG Hong(Key Laboratory of Time Reference and Applications,National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China;Hefei National Laboratory,Hefei 230088,China;Department of Physics,Xinzhou Normal University,Xinzhou 034000,China;Chongqing Key Laboratory for Strongly Coupled Physics,Department of Physics,Chongqing University,Chongqing 401331,China;Center of Modern Physics,Institute for Smart City of Chongqing University in Liyang,Liyang,213300,China)

机构地区：[1]中国科学院国家授时中心,中国科学院时间基准及应用重点实验室,西安710600 [2]中国科学院大学天文与空间科学学院,北京100049 [3]合肥国家实验室,合肥230088 [4]忻州师范学院物理系,忻州034000 [5]重庆大学,强耦合体系微观物理重庆市重点实验室,重庆401331 [6]重庆大学溧阳智慧城市研究院,现代物理研究中心,溧阳213300

出　　处：《物理学报》2025年第7期149-155,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:62405327);科技创新2030-“量子通信与量子计算机”重大项目(批准号:2021ZD0300902)资助的课题。

摘　　要：时域Landau-Zener-Stückelberg-Majorana干涉在量子态操控、延长量子态寿命和抑制系统退相干方面具有重要应用价值.本文基于^(87)Sr光晶格钟平台,通过周期性调制698 nm钟激光频率并优化光钟系统参数,在快通道极限下实现了Landau-Zener跃迁,并测量了不同实验参数下的时域Landau-Zener-Stückelberg-Majorana干涉边带谱.由于调制后的激光与原子相互作用在时域上展现出干涉现象,因此,通过改变激光失谐可以探测不同钟激光作用时间下的时域干涉边带谱.实验结果表明,当钟激光作用时间为调制周期的整数倍时,扫描钟激光的频率失谐,干涉边带谱关于零失谐频率呈非对称分布.而当作用时间为调制周期的半整数倍时,干涉边带谱则呈对称分布.该现象源于钟跃迁量子态演化过程中积累的有效动力学相位.时域Landau-Zener-Stückelberg-Major ana干涉谱的研究为未来基于光晶格钟平台的态制备和研究噪声对Landau-Zener跃迁的影响奠定了实验基础.Landau-Zener-Stückelberg-Majorana(LZSM) interference has significant application value in quantum state manipulation,extending quantum state lifetime,and suppressing decoherence.Optical lattice clock,with a long coherence time,increases the likelihood of experimentally observing time-domain LZSM interference.Although time-dominant Landau-Zener(LZ) Rabi oscillations have already been observed in optical lattice clock,the time-dominant LZSM interference sidebands in optical lattice clock remain unexplored.This study is based on an ~(87)Sr optical lattice clock.By periodically modulating the frequency of the 698-nm clock laser and optimizing the parameters of the optical clock system,LZ transitions are achieved under the fast-passage limit(FPL).During the clock detection,two acoustic optical modulators(AOMs) are employed:AOM1 that compensates for the frequency drift of the clock laser and operates continuously throughout the experiment,and AOM2 that performs traditional clock transition detection and generates a cosine modulation signal by using an external trigger from the RF signal generator in Burst mode.Ultimately,the periodically modulated 698-nm clock laser with a frequency of ω(t)=cos [∫(ω_p-Aω_s cosω_st) dt] is used to probe atoms,and the Hamiltonian is ■.As the modulated laser interacts with the atoms,the interference phenomenon is exhibited in the time domain;adjusting the clock laser detuning allows for probing the time-domain LZSM interference sideband spectra at different detection times.The results show that the time-domain LZSM interference sideband consists of multiple sidebands.Specifically,±kth order sidebands can be observed at δ/ω_s=k,where k is an integer,representing constructive interference.Additionally,due to the different LZ Rabi oscillation periods for each sideband,the excitation fractions of different sidebands are also different,resulting in different excitation fractions for sidebands at the same clock detection time.When scanning the frequency of the clock laser,small inte

关 键 词：Landau-Zener跃迁 时域Landau-Zener-Stückelberg-Majorana干涉 光晶格钟 

分 类 号：O431[机械工程—光学工程] O562[理学—光学]