Single Qubit and Its Universal Logic Gate Made of a Heisenberg Spin Cluster with Five Particles  

作　　者：陶军 王顺金 

机构地区：[1]Center of Theoretical Physics, School of Physics and Technology, Sichuan University, Chengdu 610064

出　　处：《Chinese Physics Letters》2006年第12期3131-3134,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 10375039 and 90503008, the Doctoral Fund of Ministry of Education of China, and the Center of Theoretical Nuclear Physics of HIRFL of China.

摘　　要：We investigate an anisotropic Heisenberg spin cluster with five particles controlled by a time-dependent magnetic field. With the algebraic dynamical method, we obtain the exact analytical solution to the time dependent Schr6dinger equation. Based on the analytical solution, it is shown that the system can be used as a universal single qubit logic gate controlled by the strength and frequency of the magnetic field, and the six special single qubit logic gates can be realized physically. We also discuss the anti-decoherence property of the qubit and its logic gates resulted from particle coupling effect and collectivity of the cluster.We investigate an anisotropic Heisenberg spin cluster with five particles controlled by a time-dependent magnetic field. With the algebraic dynamical method, we obtain the exact analytical solution to the time dependent Schr6dinger equation. Based on the analytical solution, it is shown that the system can be used as a universal single qubit logic gate controlled by the strength and frequency of the magnetic field, and the six special single qubit logic gates can be realized physically. We also discuss the anti-decoherence property of the qubit and its logic gates resulted from particle coupling effect and collectivity of the cluster.

关 键 词：QUANTUM COMPUTATION 

分 类 号：TP38[自动化与计算机技术—计算机系统结构]