Entanglement between two atoms mediated by two dissipative optical cavities

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作者：
机构：
[1] Department of Physics and Electronic Science, Changsha University of Science and Technology, Changsha, 410004, Hunan
来源：
Wang, Chengzhi | 1600年 / Chinese Optical Society卷 / 33期
关键词：
Entanglement; Markovian environment; Master equation; Quantum optics;
D O I：
10.3788/AOS201333.s227001
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摘要：
The quantum entanglement between two atoms each trapped in a dissipative cavity is studied. The effects of mean number of photons and the dissipation of the cavities on the entanglement are investigated in detail. It is found that the increase of mean number of photons can accelerate the decay of entanglement, while the intensive dissipation of the cavities restrains the decay. From the point of entanglement dynamics, the system of two atoms is equivalent to the system of two qubits subject to non-Markovian environment, and equivalent to the system of two coupled qubits exposed to the Markovian bath. For the initial X-form states of two atoms, it is found that the stationary entanglement decreases as mean number of photons increases, while increases with dissipation increasing. Based on the equation of the stationary entanglement, the conditions under which the entanglement sudden death appears are given.
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