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Entropy 2015, 17(7), 4547-4562; doi:10.3390/e17074547

Noiseless Linear Amplifiers in Entanglement-Based Continuous-Variable Quantum Key Distribution

State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics Engineering and Computer Science, Center for Quantum Information Technology and Center for Computational Science and Engineering, Peking University, Beijing 100871, China
QKD Corp., 60 St. George St., Toronto, M5S 1A7, Canada
Department of Physics, University of Toronto, Toronto, M5S 1A7, Canada
Department of Computer Science, University of York, Deramore Lane, York YO10 5GH, UK
Author to whom correspondence should be addressed.
Academic Editor: Jay Lawrence
Received: 27 March 2015 / Revised: 4 June 2015 / Accepted: 23 June 2015 / Published: 26 June 2015
(This article belongs to the Special Issue Quantum Cryptography)
View Full-Text   |   Download PDF [1138 KB, uploaded 26 June 2015]   |  


We propose a method to improve the performance of two entanglement-based continuous-variable quantum key distribution protocols using noiseless linear amplifiers. The two entanglement-based schemes consist of an entanglement distribution protocol with an untrusted source and an entanglement swapping protocol with an untrusted relay. Simulation results show that the noiseless linear amplifiers can improve the performance of these two protocols, in terms of maximal transmission distances, when we consider small amounts of entanglement, as typical in realistic setups. View Full-Text
Keywords: quantum key distribution; continuous-variable quantum key distribution; noiseless linear amplifiers quantum key distribution; continuous-variable quantum key distribution; noiseless linear amplifiers

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhang, Y.; Li, Z.; Weedbrook, C.; Marshall, K.; Pirandola, S.; Yu, S.; Guo, H. Noiseless Linear Amplifiers in Entanglement-Based Continuous-Variable Quantum Key Distribution. Entropy 2015, 17, 4547-4562.

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