Exact dynamics of a two-qubit system in a spin star environment

被引：9
|
作者：
Hamdouni, Y.
Fannes, M.
Petruccione, F.
机构：
[1] Univ KwuZulu Natal, Sch Phys, ZA-4001 Durban, South Africa
[2] Univ Louvain, Inst Theoret Phys, B-3001 Heverlee, Belgium
来源：
PHYSICAL REVIEW B | 2006年 / 73卷 / 24期
关键词：
D O I：
10.1016/PhysRevB.73.245323
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We derive the exact reduced dynamics of a central two-qubit system in a spin star configuration. The exact evolution of the reduced system density matrix is obtained and we compute the limit of an infinite number of environment spins. Initially pure states of the central system evolve into mixed ones and we determine the decoherence-free states of the model. The long-time behavior is studied, partial decoherence is shown to be a result of the coupling of the qubits to the environment, and entanglement evolution of the central system is investigated.
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页数：12
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