Microscopic and phenomenological models of driven systems in structured reservoirs

Abstract

We study the paradigmatic model of a qubit interacting with a structured environment and driven by an external field by means of a microscopic and a phenomenological model. The validity of the so-called fixed-dissipator (FD) assumption, where the dissipation is taken as the one of the undriven qubit is discussed. In the limit of a flat spectrum, the FD model and the microscopic one remarkably practically coincide. For a structured reservoir, we show in the secular limit that steady states can be different from those determined from the FD model, opening the possibility for exploiting reservoir engineering. We explore it as a function of the control field parameters, of the characteristics of the spectral density and of the environment temperature. The observed widening of the family of target states by reservoir engineering suggests new possibilities in quantum control protocols.

arXiv comment9 pages, 5 figures

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• Quantum state engineering by steering in the presence of errors
• Light-matter interaction in open cavities with dielectric stacks
• Exploring the limits of the generation of non-classical states of spins coupled to a cavity by optimal control
• Quantum resources of the steady-state of three coupled qubits: Microscopic versus Phenomenological model