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论文类型： 期刊论文

发表时间： 2014-03-14

发表刊物： PHYSICS LETTERS A

收录刊物： SCIE、Scopus

卷号： 378

期号： 16-17

页面范围： 1074-1080

ISSN号： 0375-9601

关键字： Lyapunov quantum control; Two-level system

摘要： Taking a two-level system as an example, we show that a strong control field may enhance the efficiency of optimal Lyapunov quantum control but could decrease its control fidelity. A relationship between the strength of the control field and the control fidelity is established. An extended technique, which combines free evolution and external control, is proposed to improve the control fidelity. We analytically demonstrate that the extended technique can be used to design a control law for steering a two-level system exactly to one predetermined eigenstate of the free Hamiltonian. In such a way, the convergence of the extended optimal Lyapunov quantum control can be guaranteed. (C) 2014 Elsevier B.V. All rights reserved.