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Open AccessArticle

Security Analysis of Unidimensional Continuous-Variable Quantum Key Distribution Using Uncertainty Relations

by Pu Wang 1, Xuyang Wang 1,2,* and Yongmin Li 1,2,*
1
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
2
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
*
Authors to whom correspondence should be addressed.
Entropy 2018, 20(3), 157; https://doi.org/10.3390/e20030157
Received: 30 January 2018 / Revised: 22 February 2018 / Accepted: 27 February 2018 / Published: 1 March 2018
(This article belongs to the Special Issue Entropy in Foundations of Quantum Physics)
We study the equivalence between the entanglement-based scheme and prepare-and-measure scheme of unidimensional (UD) continuous-variable quantum key distribution protocol. Based on this equivalence, the physicality and security of the UD coherent-state protocols in the ideal detection and realistic detection conditions are investigated using the Heisenberg uncertainty relation, respectively. We also present a method to increase both the secret key rates and maximal transmission distances of the UD coherent-state protocol by adding an optimal noise to the reconciliation side. It is expected that our analysis will aid in the practical applications of the UD protocol. View Full-Text
Keywords: continuous-variable quantum key distribution; unidimensional modulation; Heisenberg uncertainty relations continuous-variable quantum key distribution; unidimensional modulation; Heisenberg uncertainty relations
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Wang, P.; Wang, X.; Li, Y. Security Analysis of Unidimensional Continuous-Variable Quantum Key Distribution Using Uncertainty Relations. Entropy 2018, 20, 157.

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