用弱交叉Kerr非线性实现光子极化纠缠Bell态的完全区分  

Completely distinguish the photon-polarization-entangled Bell States with weak cross-Kerr nonlinearity

作　　者：章礼华[1] 刘万芳[1] 杨名[2] 曹卓良[3,2] 

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2期257-260,共4页Journal of Atomic and Molecular Physics

基　　金：安徽省高校自然科学研究项目(KJ2011Z234;KJ2012B087);国家自然科学基金(61073048;11274010;11204002)

摘　　要：基于相干态和信号位的光子数态与弱交叉Kerr非线性相互作用后,会在相干态上产生相位变化,并结合极化分束器构造了一个奇偶校验测量装置.用零差探测器对相干态的相位变化进行测量,实现对Bell态的非破坏区分.再利用控制非门和斜置的极化分束器对两信号位光子进行控制非操作和单光子测量,完成对四个Bell态的完全区分.用到的弱交叉Kerr非线性增加了区分方案在实验上实现的可行性.After the interaction among the coherent beam, signal photon and cross-Kerr nonlinearity, the coherent beam will be picked up a phase shift. Based on this, a parity-check measurement has been con- structed by polarization beam splitter and homodyne measurement. Bell states can be distinguished by parity-check measurement without destroying the signal photons and furthermore be completely distin- guished with controlled-not gate and single-photon detections. This protocol can work on the weak re- gime of cross-Kerr nonlinearity, which increases the feasibility of this protocol in the current experimen- tal technology.

关 键 词：Bell态区分 弱交叉Kerr非线性 奇偶校验 控制非门 

分 类 号：O431[机械工程—光学工程]