Optomechanical Schrödinger cat states in a cavity Bose-Einstein condensate

查看全文 作　　者：Baijun [1]Li;Wei [2]Qin;Ya-Feng [1,3]Jiao;Cui-Lu [1]Zhai;Xun-Wei [1]Xu;Le-Man [1]Kuang;Hui [1]Jing 机构地区：[1]Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education,Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications,Hunan Normal University,Changsha 410081,China;[2]Theoretical Quantum Physics Laboratory,RIKEN Cluster for Pioneering Research,Wako-shi,Saitama 351-0198,Japan;[3]Laboratory of Chemical Biology&Traditional Chinese Medicine Research,Ministry of Education College of Chemistry and Chemical Engineering,Hunan Normal University,Changsha 410081,China 出　　处：《Fundamental Research》索引2023年第3卷第1期,共6页 基　　金：supported by the National Natural Science Foundation of China(NSFC)(11935006 and 11774086);the Science and Technology Innovation Program of Hunan Province(2020RC4047);L.-M.K.was supported by the NSFC(1217050862,11935006 and 11775075);X.-W.X.was supported by the NSFC(12064010);Natural Science Foundation of Hunan Province of China(2021JJ20036);Y.-F.J.was supported by the NSFC(12147156);the China Postdoctoral Science Foundation(2021M701176);the Science and Technology Innovation Program of Hunan Province(2021RC2078);B.J.L.was supported by Postgraduate Scientific Research Innovation Project of Hunan Province(CX20210471). 摘　　要：Schrödinger cat states,consisting of superpositions of macroscopically distinct states,provide key resources for a large number of emerging quantum technologies in quantum information processing.Here we propose how to generate and manipulate mechanical and optical Schrödinger cat states with distinguishable superposition components by exploiting the unique properties of cavity optomechanical systems based on Bose-Einstein condensate.Specifically,we show that in comparison with its solid-state counterparts,almost a 3 order of magnitude enhancement in the size of the mechanical Schrödinger cat state could be achieved,characterizing a much smaller overlap between its two superposed coherent-state components.By exploiting this generated cat state,we further show how to engineer the quadrature squeezing of the mechanical mode.Besides,we also provide an efficient method to create multicomponent optical Schrödinger cat states in our proposed scheme.Our work opens up a new way to achieve nonclassical states of massive objects,facilitating the development of fault-tolerant quantum processors and sensors. 关 键 词：Schrödinger cat state Cavity Optomechanics Bose-Einstein condensate Collective density excitation SQUEEZING