Dynamical echo in two-state quantum systems
Dynamical echo in two-state quantum systems
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DOI：
10.1016/j.chaos.2006.03.036
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发表时间：
2007-08
影响因子：
7.8
通讯作者：
R. Sankaranarayanan;Jane H. Sheeba;M. Lakshmanan
中科院分区：
文献类型：
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作者：
R. Sankaranarayanan;Jane H. Sheeba;M. Lakshmanan
研究了周期回波条件下二能级系统量子保真度的演化。对于时间无关的情况，我们得到了控制哈密顿量的一个形式条件，在此条件下系统显示周期性量子回波。此外，对暴露于均匀旋转磁场下的单自旋-1/2系统的重新考察表明，众所周知的拉比振荡是产生这种回波的简单机制。
Evolution of quantum fidelity for two-level systems is studied in the context of periodic echo. For time independent case, we obtain a formal condition on the governing Hamiltonians under which the systems display periodic quantum echo. In addition, a revisit of single spin-1/2 system exposed to uniform rotating magnetic field elucidates that the well known Rabi oscillation is a simple mechanism to generate such echoes.