Nonlocal unambiguous discrimination among N nonorthogonal qudit states lying in a higher-dimensional Hilbert space  

作　　者：CHEN LiBing LU Hong 

机构地区：[1]Department of Photoelectron and Physics, Foshan University, Foshan 528000, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2012年第1期55-59,共5页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Natural Science Foundation of Guangdong Province, China (Grant No. 06029431)

摘　　要：We give a strategy for nonlocal unambiguous discrimination (UD) among N linearly independent nonorthogonal qudit states lying in a higher-dimensional Hilbert space. The procedure we use is a nonlocal positive operator valued measurement (POVM) in a direct sum space. This scheme is designed for obtaining the conclusive nonlocal measurement results with a finite probability of success. We construct a quantum network for realizing the nonlocal UD with a set of two-level remote rotations, and thus provide a feasible physical means to realize the nonlocal UD.We give a strategy for nonlocal unambiguous discrimination （UD） among N linearly independent nonorthogonal qudit states lying in a higher-dimensional Hilbert space. The procedure we use is a nonlocal positive operator valued measurement （POVM） in a direct sum space. This scheme is designed for obtaining the conclusive nonlocal measurement results with a finite probability of success. We construct a quantum network for realizing the nonlocal UD with a set of two-level remote rotations, and thus provide a feasible physical means to realize the nonlocal UD.

关 键 词：NONLOCAL unambiguous discrimination linearly independent nonorthogonal states positive operator valued measurement （POVM） remote rotation 

分 类 号：O177.1[理学—数学] U661.1[理学—基础数学]