Coherent state transfer through a multi-channel quantum network： Natural versus controlled evolution passage  

作　　者：Bing Chen Yong Li 

机构地区：[1]College of Electronics, Communication and Physics, Shandong University of Science and Technology, Qingdao 266510, China [2]Beijing Computational Science Research Center, Beijing 100084, China [3]Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2016年第4期13-18,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11422437;11174027;11105086;and 11121403);the National Basic Research Program of China(Grants Nos.2012CB922104and 2014CB921403)

摘　　要：Quantum state transfer(QST) is an important task in quantum information processing. In this study, we describe two approaches for the high-fidelity transfer of a quantum state between two opposite quantum dots attached to a multi-channel quantum network.First, we demonstrate that a high-efficiency QST can be achieved with the coherent time evolution of a quantum system without any external control. Second, we present an approach that uses an alternative mechanism for a high-fidelity QST. By adiabatically varying tunnel couplings, it is possible to implement the complete transmission of a quantum state based on this quantum mechanical mechanism.Quantum state transfer（QST） is an important task in quantum information processing. In this study, we describe two approaches for the high-fidelity transfer of a quantum state between two opposite quantum dots attached to a multi-channel quantum network.First, we demonstrate that a high-efficiency QST can be achieved with the coherent time evolution of a quantum system without any external control. Second, we present an approach that uses an alternative mechanism for a high-fidelity QST. By adiabatically varying tunnel couplings, it is possible to implement the complete transmission of a quantum state based on this quantum mechanical mechanism.

关 键 词：tight-binding model quantum state transfer adiabatic passage 

分 类 号：O413[理学—理论物理] O413.1[理学—物理]