明亮EPR光束的量子纠缠交换  

Entanglement Swapping of Bright EPR Optical Beams

作　　者：张靖[1] 谢常德[1] 

机构地区：[1]量子光学与光量子器件国家重点实验室,山西大学光电研究所,太原030006

出　　处：《量子光学学报》2002年第1期42-46,共5页Journal of Quantum Optics

基　　金：国家重点基础研究规划基金 (NO .2 0 0 1CB30 930 4 ) ;国家自然科学基金 (NO .6 98370 10 );教育部优秀青年教师基金;山西省青年科学基金 .

摘　　要：文中提出一个实现明亮光场量子纠缠交换的理论方案。两个独立的非简并光学参量放大器产生两组经典相干的明亮EPR光束对 ,通过在每一组EPR光束对的一半上执行联合贝尔态测量 ,使未产生相互作用的另一半之间产生量子纠缠。在我们的系统中由于采用贝尔态直接探测替代通常的平衡零差探测 ,不需要本底振荡光 ,减小了实验难度并能提高探测效率。A scheme achieving quantum entanglement swapping between two pairs of bright EPR optical beams is theoretically proposed. Two pairs of coherent EPR beams are produced from two independent nondegenerate optical parametric amplifiers. The entanglement swapping is demonstrated by means of a half of each EPR beam. The measuring process entangles other two halves of EPR beams that have never directly interacted with each other. In the proposed system, the direct detection of Bell-states is applied instead of usual homodyne detetion. Due to that the local oscillator is not needed, the technic trouble for mode-matching is overcome and the efficiency of the detection can be increased in experiments.

关 键 词：纠缠交换 量子关联 EPR光束 探测效率 量子信息 量子态 非简并光学参量放大器 非局域量子纠缠 明亮光场 

分 类 号：TN722.32[电子电信—电路与系统] O431.2[机械工程—光学工程]