Adiabaticity in state preparation for spin squeezing of large atom ensembles  

作　　者：SHENCHAO JIN HAN BAO JUNLEI DUAN XINGDA LU MINGFENG WANG KAI-FENG ZHAO HENG SHEN YANHONG XIAO 

机构地区：[1]Department of Physics,State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education),Fudan University,Shanghai 200433,China [2]State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,and Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China [3]Department of Physics,Wenzhou University,Wenzhou 325035,China [4]Applied Ion Beam Physics Laboratory,Key Laboratory of the Ministry of Education,and Institute of Modern Physics,Fudan University,Shanghai 200433,China [5]State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-electronics,and Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China [6]Clarendon Laboratory,University of Oxford,Oxford,0X13PU,UK

出　　处：《Photonics Research》2021年第11期2296-2302,共7页光子学研究（英文版）

基　　金：National Key Research and Development Program of China(2017YFA0304204,2016YFA0302000);National Natural Science Foundation of China(12027806,91636107);Royal Society Newton International Fellowship(NF170876);PCSIRT(IRT_17R70);1331KSC。

摘　　要：Spin-squeezed state is a many-body entangled state of great interest for precision measurements.Although the absolute sensitivity at the standard quantum limit is better for a larger atom number,the greater dominance of classical noises over atom projection noise makes it harder to achieve spin squeezing.Here,we show both theoretically and experimentally that adiabatic pulse control of the pump field in state preparation is indispensable to sufficient noise suppression,which is the prerequisite for spin squeezing.This technique is generally applicable to spin-squeezing experiments involving a large ensemble and is thus of significance for quantum metrolog yapplications.

关 键 词：ENSEMBLE STATE preparation 

分 类 号：O413[理学—理论物理]