Open Access

ARTICLE

Continuous-Variable Quantum Network Coding Based on Quantum Discord

Tao Shang^{1, *}, Ran Liu¹, Jianwei Liu¹, Yafei Hou²

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.

* Corresponding Author: Tao Shang. Email: .

Computers, Materials & Continua 2020, 64(3), 1629-1645. https://doi.org/10.32604/cmc.2020.09820

Received 20 January 2020; Accepted 10 April 2020; Issue published 30 June 2020

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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