YAO Chun-Mei1**, HE Zhi1, CHEN Zhi-Hua2, NIE Jian-Jun1
1College of Physics and Electronics, Hunan University of Arts and Science, Changde 415000 2Department of Science, Zhijiang College, Zhejiang University of Technology, Hangzhou 310024
Abstract：Through comparisons with an entanglement breaking (EB) channel, we characterize the local quantum channels that destroy quantum correlations, especially for quantum discord, and give a detailed description of a discord-breaking (DB) channel. We prove that the quantum discord can be broken if and only if the local quantum channel is a commutativity-creating (CoC) channel. Then we show which kind of channels is a CoC channel, and address the relation between EB and DB channels. Furthermore we apply our results to three typical noise channels.
2013, Vol. 30 
