Entanglement control in one-dimensional s=1/2 random XY spin chain
Shan Chuan-Jia(单传家)a)†, Cheng Wei-Wen(程维文)a), Liu Tang-Kun(刘堂昆)a), Huang Yan-Xia(黄燕霞)a), Li Hong(李宏)a), and Xia Yun-Jie(夏云杰)b)
a Department of Physics, Hubei Normal University, Huangshi 435002, China; b College of Physics and Engineering, Qufu Normal University, Qufu 273165, China
Abstract 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 system is 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.
Received: 09 June 2007
Revised: 24 September 2007
Accepted manuscript online:
(Magnetization curves, hysteresis, Barkhausen and related effects)
Fund: Project supported by the Key
Higher Education Program of Hubei Province, China (Grant No
Z20052201), Natural Science Foundation of Hubei Province, China
(Grant No 2006ABA055) and Postgraduate Program of Hubei Normal
University of China (Grant No 2007D20).
Cite this article:
Shan Chuan-Jia(单传家), Cheng Wei-Wen(程维文), Liu Tang-Kun(刘堂昆), Huang Yan-Xia(黄燕霞), Li Hong(李宏), and Xia Yun-Jie(夏云杰) Entanglement control in one-dimensional s=1/2 random XY spin chain 2008 Chin. Phys. B 17 794
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