利用Raman相互作用构造类可控非门  

Construction of Like-Control-Not Gate with Raman Interaction

作　　者：陈昌永 李韶华 

机构地区：[1]湖南省人文科技学院物理与电子信息工程系 [2]湖南省人文科技学院现代教育技术中心,湖南长沙417000

出　　处：《量子光学学报》2005年第1期20-24,共5页Journal of Quantum Optics

基　　金：湖南省青年骨干教师资助项目(2003165);湖南省教育厅科学研究资助项目(03C046);湖南人文科技学院科学研究重点资助项目(2004A014)

摘　　要：利用一个参量频率转换过程,在腔中制备双模SU(2)相干态,然后注入Λ型三能级原子,使之与腔场的一个模发生Raman相互作用,生成腔场-原子纠缠态,通过对原子进行选择性测量,可获得奇偶SU(2)相干态。我们分别将原子能级和奇偶相干态编者按码为目标量子比特和控制量子比特,利用Raman相互作用可构造出类可控非门。First, two-modes SU(2) coherent state of the cavity is prepared by a parametric frequency Conversion process. Second, a Λ-type three-level atom is injected in the cavity, leading to the interaction of the atoms and the cavity. Then the atom-cavity-field entanglement is created by atom-field Raman interaction between the atoms and the cavity field, and through the selective measurement of the atoms, the atom-field states collapse into odd or even SU(2) coherence states. Therefore, we can encode respectively the atomic levels and the odd and even coherence states into goal and control quantum bits and thus construct deterministically the like-control-not gate by use of the Raman interaction between the atoms and the fields.

关 键 词：双模SU(2)相干态 RAMAN相互作用 腔场选择性测量 

分 类 号：O431[机械工程—光学工程]