Long-lived quantum coherence of two-level spontaneous emission models within structured environments

TL;DR

This paper explores how structured environments can sustain long-lived quantum coherence in two-level systems, linking spectral properties to coherence preservation and guiding reservoir engineering for quantum technologies.

Contribution

It provides explicit relations between spectral density and quantum coherence, demonstrating how to optimize coherence preservation in non-Markovian environments.

Findings

Quantum coherence can be preserved via spectral density manipulation.

Entanglement and discord are linked to reservoir parameters.

Optimal conditions for coherence maintenance are identified.

Abstract

We investigate the long-lived quantum coherence of two-level spontaneous emission models within structured environments. The population of the system under the asymptotic non-Markovian dynamics is linked to the spectral density of the reservoir through a general functional relation between them. We figure out explicitly the preservation of quantum coherence, via notions of entanglement and quantum discord, in connection with the spectral parameters of Ohmic class reservoirs and then show how to achieve them optimally. We expect these results to contribute towards reservoir engineering with the aim of enhancing stationary quantum coherence in noisy environments.