1. Quantum Discord-Breaking Channels
- Author
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Zhi He, Jian-Jun Nie, Zhi-Hua Chen, and Chun-Mei Yao
- Subjects
Classical capacity ,Physics ,Quantum discord ,Quantum mechanics ,General Physics and Astronomy ,Quantum entanglement ,Quantum capacity ,Quantum channel ,Amplitude damping channel ,Quantum ,Noise (electronics) ,Computer Science::Information Theory - 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.
- Published
- 2013
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