Quantum dephasing dynamics in the presence of asymmetric random telegraph noise

doi:10.1088/1674-1056/ae0398

Abstract Random telegraph noise (RTN) has been widely used to describe the environmental effects on open quantum systems. In most cases, it is assumed that the environmental noise described by RTN has symmetric properties. However, in some important physical processes, the asymmetric characteristics of environmental noise play a crucial role in the dynamical evolution of the quantum systems. We theoretically study the dephasing dynamics of a two-level quantum system induced by RTN with asymmetric properties. Within the framework of the stochastic Liouville equation, we derive the exact expression of the decoherence function quantifying the coherence evolution of the quantum system. It is shown that, in contrast to the case of the symmetric RTN, the asymmetric RTN can induce a frequency shift and may lead to non-Markovian behavior in the decoherence dynamics of the quantum system. Furthermore, by adjusting the average transition rate, the transition rate difference, and the transition amplitude difference of the environmental noise, the decoherence dynamics of the quantum system can be effectively modulated.

Keywords: open systems quantum decoherence random telegraph noise stochastic fluctuations

Received: 29 June 2025
Revised: 24 August 2025
Accepted manuscript online: 05 September 2025

PACS:	02.50.-r	(Probability theory, stochastic processes, and statistics)
	03.65.Yz	(Decoherence; open systems; quantum statistical methods)
	05.10.Gg	(Stochastic analysis methods)
	05.40.-a	(Fluctuation phenomena, random processes, noise, and Brownian motion)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12005121 and 11947033).

Corresponding Authors: Xiangji Cai, Yonggang Peng
E-mail: xiangjicai@foxmail.com;ygpeng@sdu.edu.cn

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Yanyan Feng(冯言言), Jing Ren(任静), Xiangji Cai(蔡祥吉), and Yonggang Peng(彭勇刚) Quantum dephasing dynamics in the presence of asymmetric random telegraph noise 2026 Chin. Phys. B 35 040204

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Quantum dephasing dynamics in the presence of asymmetric random telegraph noise

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