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 to reservoir engineering with the aim of enhancing stationary quantum coherence in noisy environments.
© 2013 Optical Society of America
Original Manuscript: May 20, 2013
Revised Manuscript: August 20, 2013
Manuscript Accepted: August 20, 2013
Published: September 12, 2013
Ping Zhang, Bo You, and Li-Xiang Cen, "Long-lived quantum coherence of two-level spontaneous emission models within structured environments," Opt. Lett. 38, 3650-3653 (2013)