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Quantum dephasing induced by non-Markovian random telegraph noise
1School of Science, Shandong Jianzhu University, Jinan, 250101, China. xiangjicai@foxmail.com.
Scientific Reports
|January 11, 2020
Summary
We explored how quantum systems lose coherence due to environmental noise. The study shows that non-Markovian effects in dephasing depend on both the environment and system-environment interactions.
Area of Science:
- Quantum Physics
- Open Quantum Systems
- Quantum Information
Background:
- Quantum systems interact with their environments, leading to decoherence and dephasing.
- Environmental noise can exhibit complex, non-Markovian behaviors, impacting quantum dynamics.
Purpose of the Study:
- To theoretically investigate the dynamical dephasing of a quantum two-level system interacting with non-Markovian random telegraph noise.
- To derive an exact expression for the dephasing factor and analyze its dependence on environmental memory effects.
Main Methods:
- Utilized a generalized master equation to describe the time evolution of the environmental noise conditional probability.
- Derived the dephasing factor expression linked to the memory kernel of the master equation.
- Analyzed dephasing dynamics for three types of memory kernels.
Main Results:
- The non-Markovian character of quantum dephasing is not solely determined by the environment but also by the system-environment interaction.
- External modulation frequency of the environment can influence the dynamical dephasing of the quantum system.
- Demonstrated that dynamical dephasing does not always exhibit non-Markovian characteristics.
Conclusions:
- Understanding the interplay between environmental non-Markovianity and system-environment coupling is crucial for controlling quantum dephasing.
- Results offer insights into non-Markovian dynamics of open quantum systems, vital for quantum information processing.
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