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Indexed by:期刊论文

Date of Publication:2014-03-14

Journal:PHYSICS LETTERS A

Included Journals:SCIE、Scopus

Volume:378

Issue:16-17

Page Number:1074-1080

ISSN No.:0375-9601

Key Words:Lyapunov quantum control; Two-level system

Abstract: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.