一维量子点阵列自旋链上多比特态的信息传输  

Multi-bit state information transfer on the spin chain of one dimensional quantum dot array

作　　者：罗国忠[1] LUO Guozhong(Department of Physics Xin Zhou Teachers University,034000,Xinzhou,Shanxi,China)

机构地区：[1]忻州师范学院物理系,山西忻州034000

出　　处：《北京师范大学学报（自然科学版）》2021年第4期445-449,共5页Journal of Beijing Normal University(Natural Science)

基　　金：2020年度山西省高等学校本科教学质量提升工程资助项目(J2020288)。

摘　　要：利用演化算符作泰勒展开,作用于初态的信息上;使用湮灭算符和其所产生的算符,作用在单比特态上,使一维量子点阵列自旋链上的多比特态量子信息实现完美传输;通过计算初态演化到末态的概率幅,使保真度达到1时实现信息完美传输.结果表明:当相邻量子点之间的交换相互作用和自旋链长度都相同时,保真度传输的比特数越大,传输时间越短.The evolution operator is first used to act on the initial state after its Taylor expansion.The annihilation operator and production operator are then employed in acting on single bit state.The quantum information of the multi-bit state on the spin chain of one-dimensional quantum dot array can finally be transferred perfectly by using this method.By calculating the probability amplitude from the initial state to the final state,when the fidelity reaches 1,the perfect transfer of information is realized.It is found that when exchange interaction between adjacent quantum dots and spin chain length remain the same,larger of the number of bits in fidelity transfer,shorter the transfer time is.

关 键 词：量子点阵列 一维线性自旋链 演化算符 保真度 多比特态 信息传输 

分 类 号：O488[理学—固体物理]