中国物理B ›› 2021, Vol. 30 ›› Issue (2): 20301-0.doi: 10.1088/1674-1056/abc150

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  • 收稿日期:2020-07-22 修回日期:2020-09-08 接受日期:2020-10-15 出版日期:2021-01-18 发布日期:2021-01-18

Coherent-driving-assisted quantum speedup in Markovian channels

Xiang Lu(鹿翔), Ying-Jie Zhang(张英杰)†, and Yun-Jie Xia(夏云杰)   

  1. 1 Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Department of Physics, Qufu Normal University, Qufu 273165, China
  • Received:2020-07-22 Revised:2020-09-08 Accepted:2020-10-15 Online:2021-01-18 Published:2021-01-18
  • Contact: Corresponding author. E-mail: yingjiezhang@qfnu.edu.cn
  • Supported by:
    Project supported by the Shandong Provincial Natural Science Foundation, China (Grant No. ZR2020MA086) and the National Natural Science Foundation of China (Grant Nos. 61675115 and 11974209).

Abstract: As is well known, the quantum evolution speed of quantum state can never be accelerated in the Markovian regime without any operators on the system. The Hamiltonian corrections induced by the action of coherent driving forces are often used to fight dissipative and decoherence mechanisms in experiments. For this reason, considering three noisy channels (the phase-flip channel, the amplitude damping channel and the depolarizing channel), we propose a scheme of speedup evolution of an open system by controlling an external unitary coherent driving operator on the system. It is shown that, in the presence of the coherent driving, no-speedup evolution can be transformed into quantum speedup evolution in the Markovian dynamics process. Additionally, under the fixed coherent driving strength in the above three noisy channels, the best way to achieve the most degree of quantum speedup for the system has been acquired by rotating the system with appropriate driving direction angles, respectively. Finally, we conclude that the reason for this acceleration is not the non-Markovian dynamical behavior of the system but due to the oscillation of geometric distance between the initial state and the target final state.

Key words: quantum dynamics control, quantum speed limit, Markovian dynamics

中图分类号:  (Decoherence; open systems; quantum statistical methods)

  • 03.65.Yz
03.65.Ta (Foundations of quantum mechanics; measurement theory) 42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)