Modeling and physically interpreting dissipative dynamics of a charge qubit-atom hybrid system under the Born-Markov limit

Abstract

In this study, we model the dissipative dynamics of a charge qubit-atom hybrid model under the Born-Markov limit. Especially, we focus on the physical relation between spectral density and dissipative dynamics. Analytically, we show that, if spectral density in the dynamics is a nearly linear function, then relaxation and dephasing noises separately affect the gate capacitor and Josephson junction, respectively, but if the spectral density is a genuine-nonlinear function, then these two noises affect both the gate capacitor and Josephson junction. Further, we observe that in a numerical way, when the spectral density is a genuine-nonlinear function, there are some cases in which the corresponding environment dramatically breaks quantumness including purity and entanglement. (c) 2022 Optica Publishing Group