Steady-state coherence of spin-boson model in a general non-Markovian environment

Fangqin Jin, Wen-Long You, Yue Dai, Tian-Cheng Yi, Yuli Dong and Chengjie Zhang
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Fangqin Jin: ��School of Physical Science and Technology, Soochow University, Suzhou 215006, P. R. China
Wen-Long You: ��College of Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, P. R. China
Yue Dai: ��School of Optical and Electronic Information, Suzhou City University, Suzhou 215104, P. R. China
Tian-Cheng Yi: �Beijing Computational Science Research Center, Beijing 100193, P. R. China
Yuli Dong: ��School of Physical Science and Technology, Soochow University, Suzhou 215006, P. R. China
Chengjie Zhang: �School of Physical Science and Technology, Ningbo University, Ningbo 315211, P. R. China

International Journal of Modern Physics C (IJMPC), 2024, vol. 35, issue 05, 1-17

Abstract: Based on the quantum coherence theory, we employ the l1-norm measure to explore the steady-state coherence (SSC) in the spin-boson model. In this model, the environment is a non-Markovian bosonic bath with Ohmic-like spectral density. More generally, the interaction coupling between the qubit and the environment is a linear superposition of pure dephasing and pure damping coupling. Governed by the non-Markovian dynamics, some compact expressions of the SSC have been obtained at both zero temperature and high temperature. It shows that the hybrid coupling significantly affects the SSC. Moreover, a comprehensive analysis has been conducted to investigate the effects of various crucial factors, including the temperature of the bosonic bath, the qubit’s tunneling and the Ohmicity parameter. This analysis provides an effective approach for maintaining a relatively high SSC by manipulating system parameters.

Keywords: Coherence; open system; non-Markovian dynamics (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1142/S0129183124500542

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