Controllable dynamics of two separate qubits in Bell states

Controllable dynamics of two separate qubits in Bell states
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贝尔态下两个独立量子位的可控动力学

DOI:
10.1103/physreva.76.032322
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发表时间:
2007-05
期刊:
影响因子:
2.9
通讯作者:
Jing, Jun
Jing, Jun
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yang, Guo-hong;Lu, Zhi-guo;Jing, Jun

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研究了在Bell态中制备的两个自旋为1/2的量子比特子系统的纠缠和保真度动力学。其中一个标记为A的子系统量子位受到海森堡XY自旋浴的影响,而另一个标记为B的子系统量子位与之解耦。我们讨论两种情况:(i)浴自旋的数量是无限的,N{yield}{infinity},和(ii)N是有限的,N=40。在这两种情况下,浴最初在热平衡状态下制备。结果表明,通过调节自旋池的各向异性参数、温度以及与量子比特A的耦合强度,可以控制两个子系统量子比特的并发度和保真度的时间依赖性.有趣的是,发现并发的动力学是独立的四个不同的初始贝尔态和保真度分为两组。
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.
DOI: --
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期刊: --
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