由 XXZ-Hamiltonian 控制的状态转移中远程状态恢复的几个方面

IF 0.8 Q2 MATHEMATICS
G. A. Bochkin, S. I. Doronin, E. B. Fel’dman, E. I. Kuznetsova, I. D. Lazarev, A. N. Pechen, A. I. Zenchuk
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引用次数: 0

摘要

摘要 我们考虑了一个自旋系统中零阶相干矩阵(PTZ)的远程状态恢复和完美转移问题,该自旋系统受守恒激励数的 XXZ-哈密顿支配。恢复工具由哈密顿中的几个非零拉莫尔频率表示。为了简化分析,我们使用了两种近似模型,包括拉莫尔频率的阶跃型或脉冲型时间依赖性。我们研究了多达 20 个节点的自旋链中的恢复。在研究 PTZ 时,我们考虑了之字形和矩形配置,并利用通信线路的几何参数以及扩展接收器的特殊单元变换优化了 0 阶相干矩阵的传输。总体观察结果表明,XXZ 链比 XX 链需要更长的状态转移时间,这一点在最近邻近似下的演化分析研究中得到了证实。我们证明了状态转移时间随自旋链长度呈指数增长。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Some Aspects of Remote State Restoring in State Transfer Governed by XXZ-Hamiltonian

Some Aspects of Remote State Restoring in State Transfer Governed by XXZ-Hamiltonian

Abstract

We consider the remote state restoring and perfect transfer of the zero-order coherence matrix (PTZ) in a spin system governed by the XXZ-Hamiltonian conserving the excitation number. The restoring tool is represented by several nonzero Larmor frequencies in the Hamiltonian. To simplify the analysis we use two approximating models including either step-wise or pulse-type time-dependence of the Larmor frequencies. Restoring in spin chains with up to 20 nodes is studied. Studying PTZ, we consider the zigzag and rectangular configurations and optimize the transfer of the 0-order coherence matrix using geometrical parameters of the communication line as well as the special unitary transformation of the extended receiver. Overall observation is that XXZ-chains require longer time for state transfer than XX-chains, which is confirmed by the analytical study of the evolution under the nearest-neighbor approximation. We demonstrate the exponential increase of the state-transfer time with the spin chain length.

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来源期刊
CiteScore
1.50
自引率
42.90%
发文量
127
期刊介绍: Lobachevskii Journal of Mathematics is an international peer reviewed journal published in collaboration with the Russian Academy of Sciences and Kazan Federal University. The journal covers mathematical topics associated with the name of famous Russian mathematician Nikolai Lobachevsky (Lobachevskii). The journal publishes research articles on geometry and topology, algebra, complex analysis, functional analysis, differential equations and mathematical physics, probability theory and stochastic processes, computational mathematics, mathematical modeling, numerical methods and program complexes, computer science, optimal control, and theory of algorithms as well as applied mathematics. The journal welcomes manuscripts from all countries in the English language.
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