Cavity-enhanced metrology in an atomic spin-1 Bose−Einstein condensate  

作　　者：Renfei Zheng Jieli Qin Bing Chen Xingdong Zhao Lu Zhou 

机构地区：[1]School of Physics,Hefei University of Technology,Hefei 230009,China [2]State Key Laboratory of Precision Spectroscopy,Department of Physics,School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China [3]School of Physics and Materials Science,Guangzhou University,230 Wai Huan Xi Road,Guangzhou Higher Education Mega Center,Guangzhou 510006,China [4]Department of Physics,Henan Normal University,Xinxiang 453007,China [5]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China

出　　处：《Frontiers of physics》2024年第3期185-196,共12页物理学前沿（英文版）

摘　　要：Atom interferometer has been proven to be a powerful tool for precision metrology. Here we propose a cavity-aided nonlinear atom interferometer, based on the quasi-periodic spin mixing dynamics of an atomic spin-1 Bose−Einstein condensate trapped in an optical cavity. We unravel that the phase sensitivity can be greatly enhanced with the cavity-mediated nonlinear interaction. The influence of encoding phase, splitting time and recombining time on phase sensitivity are carefully studied. In addition, we demonstrate a dynamical phase transition in the system. Around the criticality, a small cavity light field variation can arouse a strong response of the atomic condensate, which can serve as a new resource for enhanced sensing. This work provides a robust protocol for cavity-enhanced metrology.

关 键 词：nonlinear atom interferometer spin-1 Bose−Einstein condensate spin-mixing dynamics quantum Fisher information parameter estimation 

分 类 号：O41[理学—理论物理]