Dynamics of quantum discord in the purification process |
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| Authors: | Wei Song Lin Chen Ming Yang Zhuo-Liang Cao |
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| Institution: | 1. Department of Physics and Electronic Engineering, Hefei Normal University, Hefei 230061, China;2. Department of Pure Mathematics and Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada;3. Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117542, Singapore;4. School of Physics and Material Science, Anhui University, Hefei 230039, China |
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| Abstract: | We investigate the dynamics of quantum discord during the purification process. In the case of Werner states, it is shown that quantum discord is increased after a round of purification protocol. Furthermore, quantum mutual information and classical correlation is also increased during this process. We also give an analytic expression for a class of higher dimensional states which have additive quantum discord. |
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| Keywords: | Quantum discord Dynamics process Purification |
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