Entanglement control in one-dimensional s = 1/2 random XY spin chain

• 来源期刊: 中国物理B（英文版）
• 关键词: the entanglement spin chain spin-spin correlation function Gaussian distribution
• 年，卷（期）: 2008,（3）
• 页码范围: 794-800
• 页数: 7页
• 语种: 英文

摘要

The entanglement in one-dimensional random XY spin systems where the impurities of exchange couplings and the external magnetic fields are considered as random variables is investigated by solving the different spin-spin correlation functions and the average magnetization per spin. The entanglement dynamics near particular locations of the systemis also studied when the exchange couplings (or the external magnetic fields) satisfy three different distributions (the Gaussian distribution, double-Gaussian distribution, and bimodal distribution). We find that the entanglement can be controlled by varying the strength of external magnetic field and the distributions of impurities.Moreover, the entanglement of some nearest-neighbouring qubits can be increased for certain parameter values of the three different distributions.