Controlling quantum discord dynamics in cavity QED systems by applying a classical driving field with phase decoherence
Controlling quantum discord dynamics in cavity QED systems by applying a classical driving field with phase decoherence
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DOI：
10.1088/1674-1056/21/3/030305
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发表时间：
2012-03
影响因子：
1.7
通讯作者：
Y. Qian;Jingpin Xu
中科院分区：
文献类型：
--
作者：
Y. Qian;Jingpin Xu
研究了存在相位退相干的二能级原子与量子化腔场和经典驱动场的相互作用，发现当时间趋于无穷大时，原子与腔场的相互作用中会出现稳态量子不和谐。我们还发现，通过施加经典驱动场，可以增加稳态量子不和谐。进一步研究了在相位退相干存在下，两个全同非相互作用的二能级原子与量子化腔场和经典驱动场独立相互作用系统的量子失谐动力学.结果表明，在相位退相干条件下，两原子间的量子不协调比纠缠更鲁棒，经典驱动场有助于提高两原子间的量子不协调量。
We investigate a two-level atom interacting with a quantized cavity field and a classical driving field in the presence of phase decoherence and find that a stationary quantum discord can arise in the interaction of the atom and cavity field as the time turns to infinity. We also find that the stationary quantum discord can be increased by applying a classical driving field. Furthermore, we explore the quantum discord dynamics of two identical non-interacting two-level atoms independently interacting with a quantized cavity field and a classical driving field in the presence of phase decoherence. Results show that the quantum discord between two atoms is more robust than entanglement under phase decoherence and the classical driving field can help to improve the amount of quantum discord of the two atoms.