Controllable dynamics of two separate qubits in Bell states
Controllable dynamics of two separate qubits in Bell states
复制标题
贝尔态下两个独立量子位的可控动力学
DOI:
10.1103/physreva.76.032322
复制
发表时间:
2007-05
影响因子:
2.9
通讯作者:
Jing, Jun
中科院分区:
文献类型:
--
作者:
Yang, Guo-hong;Lu, Zhi-guo;Jing, Jun
The dynamics of entanglement and fidelity for a subsystem of two separate spin-1/2 qubits prepared in Bell states is investigated. One of the subsystem qubit labeled A is under the influence of a Heisenberg XY spin bath, while another one labeled B is uncoupled with that. We discuss two cases: (i) the number of bath spins is infinite, N{yields}{infinity}, and (ii) N is finite, N=40. In both cases, the bath is initially prepared in a thermal equilibrium state. It is shown that the time dependence of the concurrence and the fidelity of the two subsystem qubits can be controlled by tuning the parameters of the spin bath, such as the anisotropic parameter, the temperature, and the coupling strength with qubit A. It is interesting to find that the dynamics of the concurrence is independent of four different initial Bell states and that of the fidelity is divided into two groups.
登录
查看更多内容
DOI:
--
发表时间:
2005
期刊:
--
影响因子:
--
作者:
Z. Ficek;S. Swain
通讯作者:
Z. Ficek;S. Swain
DOI:
10.1142/1476
发表时间:
1993-03
期刊:
--
影响因子:
--
作者:
U. Weiss
通讯作者:
U. Weiss
DOI:
10.1103/physreve.75.016701
发表时间:
2006-11
期刊:
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子:
--
作者:
J. Jing;Hongru Ma
通讯作者:
J. Jing;Hongru Ma
DOI:
10.1103/physreva.54.2614
发表时间:
1996-10
期刊:
Physical review. A, Atomic, molecular, and optical physics
影响因子:
--
作者:
B. Schumacher
通讯作者:
B. Schumacher
DOI:
10.1088/0305-4470/36/49/012
发表时间:
2002-09
期刊:
Journal of Physics A
影响因子:
--
作者:
L. Tessieri;J. Wilkie
通讯作者:
L. Tessieri;J. Wilkie