Continuous-Variable Quantum Network Coding Based on Quantum Discord |
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Authors: | Tao Shang Ran Liu Jianwei Liu Yafei Hou |
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Affiliation: | 1.School of Cyber Science & Technology, Beihang University, Beijing, 100083, China.2 Graduate School of Natural Science and Technology, Okayama University, Okayama Prefecture, 700-8530, Japan. |
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Abstract: | Establishing entanglement is an essential task of quantum communication technology. Beyond entanglement, quantum discord, as a measure of quantum correlation, is a necessary prerequisite to the success of entanglement distribution. To realize efficient quantum communication based on quantum discord, in this paper, we consider the practical advantages of continuous variables and propose a feasible continuous-variable quantum network coding scheme based on quantum discord. By means of entanglement distribution by separable states, it can achieve quantum entanglement distribution from sources to targets in a butterfly network. Compared with the representative discrete-variable quantum network coding schemes, the proposed continuous-variable quantum network coding scheme has a higher probability of entanglement distribution and defends against eavesdropping and forgery attacks. Particularly, the deduced relationship indicates that the increase in entanglement is less than or equal to quantum discord. |
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Keywords: | Continuous variable quantum network coding quantum discord entanglement distribution Gaussian cloning. |
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