Suppression of decoherence dynamics by a dissipative bath at strong coupling
Phys. Rev. A 112, 022209 – Published 12 August, 2025
DOI: https://doi.org/10.1103/3d9c-4x2q
Abstract
Control of decoherence in open quantum systems has become a topic of great interest due to the emergence of quantum technologies that depend on quantum coherence effects. In this work, we investigate the decoherence dynamics of systems coupled to multiple baths through noncommuting systems' operators and beyond the weak system-bath coupling limit. By building on cooperative effects between baths, we propose a strategy to mitigate rapid decoherence. Concretely, we study the dynamics of a qubit coupled to multiple environments with arbitrary interaction strengths and along different coordinates. Based on insights gained on the decoherence dynamics from the analytical effective Hamiltonian method, we carry out numerical simulations using the reaction coordinate quantum master equation method. We show that when the system strongly interacts with a decohering bath, increasing its coupling to a second, dissipative bath can slow down the decoherence dynamics in a certain parameter regime. Our work offers insights into the preservation of quantum coherence in open quantum systems based on frustration effects, by utilizing cooperative effects between different heat baths.
