基于偏振无关分束器的两光子部分纠缠态的简化浓缩方案  

Simplified entanglement concentration of partially entangled photon pairs with polarization-independent beam splitter

作　　者：章礼华[1,2] 张杰[1] 曹卓良[3,2] 杨名[2] 

机构地区：[1]安庆师范学院物理与电气工程学院,安庆246011 [2]安徽大学物理与材料科学学院,合肥230039 [3]合肥师范学院电子信息工程学院,合肥230601

出　　处：《原子与分子物理学报》2013年第6期971-975,共5页Journal of Atomic and Molecular Physics

基　　金：安徽高校省级自然科学研究项目(KJ2013A180,KJ2013Z189);国家自然科学基金(11274010,61073048)

摘　　要：经由偏振无关的光学分束器实现对未知两光子部分纠缠态的纠缠浓缩,包括利用单光子探测器的线性光学浓缩方案,和利用弱交叉Kerr非线性媒质、零拍探测的浓缩方案.两对部分纠缠的光子对中各一个信号光子同时通过偏振无关分束器后,当探测到分束器输出模中各有一个光子时,剩余的两光子将处于最大纠缠态.与以前的浓缩方案相比较,我们的浓缩方案不需要额外的Hadamard门对信号光子施加作用,所需要的光学器件较少,这增加了方案在实验实现上的可行性.We present a scheme for entanglement concentration of partially entangled photon pairs with polarization-independent beam splitter. Two partially entangled photon pairs are needed. Let one signal photon of each pairs pass through the beam splitter simultaneously. A two photon maximally entangled state can be obtained when we measured the outputting modes of the beam splitter in balanced states. This measurement can be implemented by single photon detectors directly or by balanced detection con- structed with cross-Kerr nonlinearities and Homodyne measurement. Compared with the previous con- centration schemes, our simplified scheme doesn＇t need Hadamard operations, which increases the feasi- bility of this protocol in the current experimental technology.

关 键 词：纠缠浓缩 偏振无关分束器 单光子探测器 弱交叉Kerr非线性媒质 

分 类 号：O431[机械工程—光学工程]