Steering Quantum Dynamics of a Two-Qubit System via Optimal Bang-Bang Control
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The optimization of control time for quantum systems has been an important field of control science attracting decades of focus, which is beneficial for efficiency improvement and decoherence suppression caused by the environment. Based on analyzing the advantages and disadvantages of the existing Lyapunov control, using a bang-bang optimal control technique, we investigate the fast state control in a closed two-qubit quantum system, and give three optimized control field design methods. Numerical simulation experiments indicate the effectiveness of the methods. Compared to the standard Lyapunov control or standard bang-bang control method, the optimized control field design methods effectively shorten the state control time and avoid high-frequency oscillation that occurs in bang-bang control.
KeywordsOptimal bang-bang control Fast state control Quantum system
This work is supported by the National Natural Science Foundation of China under Grant Nos. 61663016 and 11404150.