多光子偏振态与单光子高维空间态之间的相互变换及其应用  

Mapping between multi-photon polarization state and single-photon spatial qudit and its applications

作　　者：林青[1] 

机构地区：[1]华侨大学信息科学与工程学院,厦门361021

出　　处：《物理学报》2011年第8期285-291,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11005040);福建省自然科学基金(批准号:2010J05008);中央高等学校基本科研基金(批准号:JB-SJ1007)资助的课题~~

摘　　要：基于一种特殊的控制非门,实现多光子偏振态与单光子空间高维态之间的相互变换,使得对多光子偏振态的操作可以通过对单光子的操作来完成,由此可以实现任意多光子正定算符值测量和多光子任意幺正操作.这种实现方式是以一定概率完成的,但其效率要优于此前的方案,在目前的实验条件下是可行的.Based on a special controlled-NOT gate,a multi-photon state encoded in polarizations of photons could be transformed into the corresponding single photon qudit encoded in spatial mode.It will make the processing on multi-photon change into the operation on a single-photon,if the inverse transformation from a single photon qudit back to a multi-photon state could be realized also.Associated with linear optical multi-port interferometer for single-photon unitary operation,the positive-operator value measurement and the universal unitary operation for multi-photon state are realized.This approach is more efficient than the previous one with decomposition into two-qubit gates in the circuit-based quantum computation,and it is feasible with using the current experimental technology.

关 键 词：单光子空间态 特殊控制非门 线性光学多端口干涉仪 

分 类 号：O431.2[机械工程—光学工程]