Controllable Subspaces of Open Quantum Dynamical Systems  

作　　者：ZHANG Ming DAI Hong-Yi GONG Er-Ling XIE Hong-Wei HU De-Wen 

机构地区：[1]College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410073, China [2]College of Science, National University of Defense Technology, Changsha 410073, China

出　　处：《Communications in Theoretical Physics》2008年第1期61-64,共4页理论物理通讯（英文版）

基　　金：The project supported by National Natural Science Foundation of China under Grant No.60674040;National Natural Science Foundation for Distinguished Young Scholars under Grant No.60225015

摘　　要：This paper discusses the concept of controllable subspace for open quantum dynamical systems. It is constructively demonstrated that combining structural features of decoherence-free subspaces with the ability to perform open-loop coherent control on open quantum systems will allow decoherence-free subspaces to be controllable. This is in contrast to the observation that open quantum dynamical systems are not open-loop controllable. To a certain extent, this paper gives an alternative control theoretical interpretation on why decoherence-free subspaces can be useful for quantum computation.

关 键 词：quantum dynamical systems CONTROLLABILITY decoherence-free subspace 

分 类 号：O413[理学—理论物理]