Thermometry utilizing stored short-wavelength spin waves in cold atomic ensembles  

作　　者：王兴昌 王建民 左瀛 董亮 Georgios A Siviloglou 陈洁菲 Xingchang Wang;Jianmin Wang;Ying Zuo;Liang Dong;Georgios A Siviloglou;Jiefei Chen(Shenzhen Institute for Quantum Science and Engineering and Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China)

机构地区：[1]Shenzhen Institute for Quantum Science and Engineering and Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《Chinese Physics B》2023年第7期399-403,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.12074171,12074168,92265109,and 12204227);the Key Laboratory Fund from Guangdong Province,China(Grant No.2019B121203002);the Natural Science Foundation of Guangdong Province,China(Grant Nos.2022B1515020096 and 2019ZT08X324).

摘　　要：Temperature,as a measure of thermal motion,is a significant parameter characterizing a cold atomic ensemble optical quantum memory.In a cold gas,storage lifetime strongly depends on its temperature and is associated with the spin wave decoherence.Here we experimentally demonstrate a new spin wave thermometry method relying on this direct dependence.The short-wavelength spin waves resulting from the counter-propagating configuration of the control and the probe laser beams make this thermometry highly suitable for probing in situ the atomic motion in elongated clouds as the ones used in quantum memories.Our technique is realized with comparable precision for memories that rely on electromagnetically induced transparency as well as far-detuned Raman storage.

关 键 词：optical quantum memory temperature measurement collective atomic excitation electromagnetically induced transparency 

分 类 号：TP333[自动化与计算机技术—计算机系统结构] O469[自动化与计算机技术—计算机科学与技术]