期刊
PHYSICS LETTERS A
卷 384, 期 29, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.physleta.2020.126743
关键词
Time-optimal; Mixed state; Pontryagin's minimum principle; Unitary transformation
资金
- Iran National Science Foundation (INSF) [97013912]
The objective of time-optimal control that helps to minimize relaxation losses, is the evolution of a quantum state from a given initial mixed state to a final target mixed state in minimum time. In this paper, we study a time-optimal control problem of the dynamic of a pure two-level system with unbounded control using Pontryagin's minimum principle and obtain the minimal time for some initial and final states. The results will apply to basically all qubit systems that one can consider such as NMR spectroscopy, trapped ions, superconducting qubits, etc. We also show that these results hold for pure states, and only the direction (n) over cap is important in the evolution of a quantum state. In this work, the problem of computing minimum time to produce any unitary transformation U-f is an element of SU (2) is reduced to finding the minimum time to steer the system from an initial to a final state. (C) 2020 Elsevier B.V. All rights reserved.
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