Abstract
Quantum speed limit (QSL) represents the minimum evolution time of a quantum system. We investigate the QSL time of a two-level qubit in a phase-damping channel. By manipulating measurement-based feedback controls on the qubit, we show that the QSL time of the qubit can have an obvious decline when the measurement rate is high. We also study the effect from feedback and find that the QSL time can reach the largest value when the feedback angle is \({\pi \mathord{\left/ {\vphantom {\pi 2}} \right. \kern-0pt} 2}\) and it decreases symmetrically on both sides of the angle. Additionally, the QSL time of qubit in the whole dynamic process is calculated. High rate of measurement and control is helpful to drive the QSL time to a stable value at earlier time and the variation of the optimal evolution time can be witnessed by the purity of the qubit system.
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Acknowledgements
We sincerely acknowledge support from the National Nature Science Foundation of China under grants No. 12005182. This work is also sponsored by the Natural Science Research of Jiangsu Higher Education Institutions of China under grant No. 20KJB140003.
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Lu Hou wrote the main manuscript text and gave mathematical calculation for Figs. 1, 2, 3, 4, 5 and 6.Bin Shao gave the software that is used in our paper and supervised the whole process of research.Chaoquan Wang is responsible for data curation and Investigation.All authors have reviewed the manuscript.
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Hou, L., Shao, B. & Wang, C. Quantum Speed Limit Under the Influence of Measurement-based Feedback Control. Int J Theor Phys 62, 47 (2023). https://doi.org/10.1007/s10773-023-05318-8
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DOI: https://doi.org/10.1007/s10773-023-05318-8