Preservation of the geometric quantum discord in noisy environments

• Published in: Annals of physics Vol. 343; no. Complete; pp. 132 - 140
• Main Authors: Hu, Ming-Liang, Tian, Dong-Ping
• Format: Journal Article
• Language: English
• Published: New York Elsevier Inc 01.04.2014; Elsevier BV
• Subjects: Bures distance; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Correlation; Correlation analysis; CORRELATIONS; DISTANCE; GEOMETRY; Preservation; QUANTUM DECOHERENCE; Quantum discord; QUANTUM MECHANICS; Quantum physics; Reservoirs; Robustness; Strategy; Trace distance; Trace distance; Quantum discord; Bures distance
• ISSN: 0003-4916; 1096-035X
• DOI: 10.1016/j.aop.2014.02.003

Geometric description of quantum correlations is favored for their distinct physical significance. Geometric discords based on the trace distance and the Bures distance are shown to be well-defined quantum correlation measures. Here, we examine their particular dynamical behaviors under independent as well as common structured reservoirs and reveal their robustness against decoherence. We showed that the two well-defined geometric discords may be preserved well or even be improved and generated by the noisy process of the common reservoir. Moreover, we also provided a strategy for the long-time preservation of these two geometric discords in independent reservoirs. •Inherent robustness of the trace distance and the Bures distance discord.•Generating geometric discord from classical states by the noisy process.•Improvement of the geometric discord in common reservoir.•The robust pathway for preserving discord in independent reservoirs.