Quantum discord plays no distinguished role in characterization of complete positivity: Robustness of the traditional scheme

• DOI: 10.48550/arxiv.1304.4857
• Publication Date: 2013-01-01
• Authors: Krishna Kumar Sab...; J. Solomon Ivan; Sibasish Ghosh; R. Simon
• Keywords: Robustness; Quantum system

The traditional scheme for realizing open-system quantum dynamics takes the initial state of system-bath composite as a simple product. Currently, however, issue correlations possibly affecting reduced system has been attracting considerable interest. influential work Shabani and Lidar [PRL {\bf 102}, 100402 (2009)] famously related this to discord, concept which in recent years occupied centre-stage information theory led several fundamental results. They suggested that is completely positive if only have vanishing discord. Here we show there is, within Shabani-Lidar framework, no scope any distinguished role discord respect complete positivity dynamics. Since most applications real systems rests on scheme, its robustness demonstrated here could be far-reaching significance.