Geometric phase in dephasing systems
Geometric phase in dephasing systems
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DOI：
10.1103/physreva.71.044101
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发表时间：
2005-01
影响因子：
2.9
通讯作者：
X. Yi;L. Wang;W. Wang
中科院分区：
文献类型：
--
作者：
X. Yi;L. Wang;W. Wang
超越量子马尔可夫近似，我们计算的几何相位的二能级系统驱动的量子化磁场受到相位退相。在弱耦合极限下，相位退化为标准几何相位，它包含了环境的一般相位信息。与耗散系统中的几何相位相反，系统获得的几何相位可以在长时间尺度上观察到。我们还表明，与系统的消粘到它的指针状态，几何相位因子往往是一个加权和的相位因子有关的指针状态。
Beyond the quantum Markov approximation, we calculate the geometric phase of a two-level system driven by a quantized magnetic field subject to phase dephasing. The phase reduces to the standard geometric phase in the weak-coupling limit, and it involves the phase information of the environment in general. In contrast with the geometric phase in dissipative systems, the geometric phase acquired by the system can be observed on a long time scale. We also show that with the system decohering to its pointer states, the geometric phase factor tends to a weighted sum over the phase factors pertaining to the pointer states.