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Open AccessArticle

Quantum Dynamics in a Fluctuating Environment

School of Science, Shandong Jianzhu University, Jinan 250101, China
Entropy 2019, 21(11), 1040; https://doi.org/10.3390/e21111040
Received: 22 September 2019 / Revised: 17 October 2019 / Accepted: 23 October 2019 / Published: 25 October 2019
(This article belongs to the Special Issue Open Quantum Systems (OQS) for Quantum Technologies)
We theoretically investigate the dynamics of a quantum system which is coupled to a fluctuating environment based on the framework of Kubo-Anderson spectral diffusion. By employing the projection operator technique, we derive two types of dynamical equations, namely, time-convolution and time-convolutionless quantum master equations, respectively. We derive the exact quantum master equations of a qubit system with both diagonal splitting and tunneling coupling when the environmental noise is subject to a random telegraph process and a Ornstein-Uhlenbeck process, respectively. For the pure decoherence case with no tunneling coupling, the expressions of the decoherence factor we obtained are consistent with the well-known existing ones. The results are significant to quantum information processing and helpful for further understanding the quantum dynamics of open quantum systems. View Full-Text
Keywords: quantum dynamics; open quantum systems; environmental fluctuations quantum dynamics; open quantum systems; environmental fluctuations
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Cai, X. Quantum Dynamics in a Fluctuating Environment. Entropy 2019, 21, 1040.

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