物理学报Issue(11)：1-8,8.DOI:10.7498/aps.63.110302
不同方向Dzyaloshinskii-Moriya相互作用和磁场对自旋系统纠缠和保真度退相干的影响
Effects of different Dzyaloshinskii-Moriya interaction and magnetic field on entanglement and fidelity intrinsic decoherence in a spin system
摘要
Abstract
Using the Milburn equation, we have studied the properties of the entanglement and fidelity dynamics in a spin system with different Dzyaloshinskii-Moriya interaction and magnetic field in detail. Effects of different Dzyaloshinskii-Moriya interaction, different magnetic fields, and the initial states on the entanglement and fidelity are discussed. Results show that entanglement decoherence can be suppressed by inhomogeneous magnetic fields. Initial state affects greatly the entanglement, and a proper entanglement can be obtained by adjusting the directions of Dzyaloshinskii-Moriya interaction. For a particular initial state, an optimal fidelity is obtained by changing the direction of the Dzyaloshinskii-Moriya interaction. Moreover, no matter how homogeneous or inhomogeneous the magnetic fields are, they cannot enhance the fidelity. The dependence of entanglement and fidelity on the angle of initial state shows periodicity. Hence we can select an optimal initial state for a specific condition according to requirement.关键词
内禀退相干/纠缠/不同方向Dzyaloshinskii-Moriya相互作用/保真度Key words
intrinsic decoherence/entanglement/different Dzyaloshinskii-Moriya interaction/fidelity引用本文复制引用
秦猛,李延标,白忠,王晓..不同方向Dzyaloshinskii-Moriya相互作用和磁场对自旋系统纠缠和保真度退相干的影响[J].物理学报,2014,(11):1-8,8.基金项目
解放军理工大学理学院青年基金(批准号：KYLYZL001313)资助的课题.@@@@Project supported by the Youth Foundation of College of Sciences, PLA University of science and technology of China (Grant No. KYLYZL001313) （批准号：KYLYZL001313）
