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二能级量子系统在开放环境下的相干保持是量子器件实用化的关键。针对二能级开放量子系统的相干保持问题,首先将系统的主方程模型转化为实向量空间上的状态空间模型。然后借助经典最优控制的思想,提出了一种既保证系统控制能量最小,同时又最大程度的减小消相干的最优控制策略。最后就一个典型的二能级开放量子系统仿真实现其相干保持,仿真结果显示了该方案的优越性。
The coherent maintenance of two-level quantum system in an open environment is the key to the practical application of quantum devices. In order to coherently maintain a two-level open quantum system, the main equation model of the system is first transformed into a state space model in real vector space. Then based on the idea of classical optimal control, an optimal control strategy is proposed which can ensure the minimum energy of system control and reduce the de-coherence at the same time. Finally, a typical two-level open quantum system simulation to achieve its coherent retention, the simulation results show the superiority of the program.