Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Asia Communications and Photonics Conference

Beating 3-dB Loss Limit of Direct Reconciliation Continuous-variable Quantum Key Distribution by Using a Noiseless Linear Amplifier

Yichen Zhang, Mingyang Xu, Shulong Han, Tianyi Wang, Song Yu, Wanyi Gu

Published Jan 1, 2013• 0 citations
Publisher

Abstract

We propose a method to improve the secret key rate and maximum transmission distance of direct reconciliation continuous variable quantum key distribution protocol by inserting a noiseless linear amplifier at the output of quantum channel.
DOI
10.1364/acp.2013.af3d.5

Related papers

Improve the maximum transmission distance of no-switching continuous-variable quantum key distribution by using a noiseless linear amplifier

Yichen Zhang, Mingyang Xu, Shulong Han +2 more

We propose a modified no-switching continuous-variable quantum key distribution protocol to improve the secret key rate and maximum transmission distance by inserting a noiseless linear amplifier at the output of quantum channel. Security analysis shows that a noiseless linear amplifier with gain g can increase the maximum transmission distance of no-switching protocol by 100log10g km

IEEE International Conference on Electronics Information and Emergency Communication•Nov 1, 2013•1 citation

Improvement of Continuous-variable Quantum Key Distribution System by Using a Practical Noiseless Linear Amplifier

Yichen Zhang, Song Yu, Wanyi Gu

We propose a practical modified continuous-variable quantum key distribution system to improve the secret key rate over long transmission distance by inserting a practical noiseless linear amplifier at the output of quantum channel.

Optical Fiber Communication Conference•Jan 1, 2014•0 citations

Improvement of no-switching continuous-variable quantum key distribution system by using a practical noiseless linear amplifier

Yichen Zhang, Song Yu, Wanyi Gu

We propose a practical modified no-switching continuous-variable quantum key distribution system to improve the secret key rate over long transmission distance by inserting a practical noiseless linear amplifier at the output of quantum channel.

URSI General Assembly and Scientific Symposium•Aug 1, 2014•0 citations

Improving the maximum transmission distance of continuous-variable quantum key distribution using a noiseless amplifier

Rémi Blandino, Anthony Leverrier, Marco Barbieri +3 more

We show that the maximum transmission distance of continuous-variable quantum key distribution in presence of a Gaussian noisy lossy channel can be arbitrarily increased using a heralded noiseless linear amplifier. We explicitly consider a protocol using amplitude- and phase-modulated coherent states with reverse reconciliation. Assuming that the secret key rate drops to zero for a line transmittance ${T}_{\mathrm{lim}}$, we find that a noiseless amplifier with amplitude gain $g$ can improve this value to ${T}_{\mathrm{lim}}/{g}^{2}$, corresponding to an increase in distance proportional to $\mathrm{log}g$.

arXiv:1205.0959•Physical Review A•Jul 23, 2012•139 citations

Improving the maximum transmission distance of four-state continuous-variable quantum key distribution by using a noiseless linear amplifier

Bingjie Xu, Chunming Tang, Hui Chen +2 more

A modified four-state CVQKD protocol is proposed to increase the maximum transmission distance and tolerable excess noise in the presence of Gaussian lossy and noisy channel by using a noiseless linear amplifier (NLA). An ideal NLA with gain $g$ can increase the maximum admission losses by $20{\mathrm{log}}_{10}g$ dB. Further, the imperfections in a practical NLA, such as the finite detection efficiency and imperfect single-photon source, are included in consideration.

arXiv:1210.0107•Physical Review A•Jun 11, 2013•34 citations

Improving the maximum transmission distance of continuous variable quantum key distribution by using a noiseless linear amplifier

Bingjie Xu, Bing Zeng

Developing quantum key distribution (QKD) protocols resistant to losses and noises is of great importance in practice. We show that the maximum transmission distance and tolerable excess noise of the Gaussian modulation (GM) and discrete modulation (DM) CVQKD protocols can be dramatically increased by using a noiseless linear amplifier (NLA). It is proved that a NLA with gain g can increase the maximum transmission distance by 20 /αlog10g km, where a = 0.2 dB/km is the loss coefficient of the fiber channel.

URSI General Assembly and Scientific Symposium•Aug 1, 2014•0 citations
We show that the maximum transmission distance of continuous-variable quantum key distribution in presence of a Gaussian noisy lossy channel can be arbitrarily increased using a heralded noiseless linear amplifier. We explicitly consider a protocol using amplitude- and phase-modulated coherent states with reverse reconciliation. Assuming that the secret key rate drops to zero for a line transmittance Tlim{T}_{\mathrm{lim}}Tlim​, we find that a noiseless amplifier with amplitude gain ggg can improve this value to Tlim/g2{T}_{\mathrm{lim}}/{g}^{2}Tlim​/g2, corresponding to an increase in distance proportional to logg\mathrm{log}glogg.
A modified four-state CVQKD protocol is proposed to increase the maximum transmission distance and tolerable excess noise in the presence of Gaussian lossy and noisy channel by using a noiseless linear amplifier (NLA). An ideal NLA with gain ggg can increase the maximum admission losses by 20log10g20{\mathrm{log}}_{10}g20log10​g dB. Further, the imperfections in a practical NLA, such as the finite detection efficiency and imperfect single-photon source, are included in consideration.
Developing quantum key distribution (QKD) protocols resistant to losses and noises is of great importance in practice. We show that the maximum transmission distance and tolerable excess noise of the Gaussian modulation (GM) and discrete modulation (DM) CVQKD protocols can be dramatically increased by using a noiseless linear amplifier (NLA). It is proved that a NLA with gain g can increase the maximum transmission distance by 20 /αlog10g km, where a = 0.2 dB/km is the loss coefficient of the fiber channel.