实验制备纯的双模压缩态  

Experimental Preparation of a Pure Two-Mode Squeezed State

作　　者：李强[1,2] 邓晓玮[1,2] 张强[1,2] 苏晓龙[1,2] 

机构地区：[1]山西大学光电研究所量子光学与光量子器件国家重点实验室,太原山西030006 [2]山西大学极端光学协同创新中心,太原山西030006

出　　处：《光学学报》2016年第4期283-289,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61475092;11522433);山西省高校优秀青年学术带头人项目(2013805)

摘　　要：从一个压缩真空态中减去一个光子是制备光学薛定谔猫态的一种有效方法。研究表明,通过这种方法制备的薛定谔猫态的保真度依赖于压缩态光场的纯度。利用一个抽运光部分共振的非简并光学参量放大器实验制备了纯度为0.993的双模压缩态。由于热效应的存在,非简并光学参量放大器在较宽的抽运功率范围内能够获得纯度较高的双模压缩态。Subtracting a photon from a squeezed vacuum state is an efficient method for preparing an optical Schrodinger cat state. It is shown that the fidelity of the Schrodinger cat state based on photon subtraction depends on the purity of squeezed vacuum state. A two-mode squeezed state of light with a purity of 0.993 is experimentally produced by a non-degenerate optical parametric amplifier, where the pump beam oscillates partially in the cavity. Especially, two-mode squeezed states with high purity can be obtained by the non-degenerate optical parametric amplifier in a wide range of pump power due to the presence of thermal effect.

关 键 词：量子光学 压缩态 薛定谔猫态 非简并光学参量放大器 热效应 

分 类 号：O431.2[机械工程—光学工程]