Abstract

The recent progress in continuous-variable quantum key distribution (CV-QKD) systems has placed them in a competitive position with their conventional discrete-variable counterparts [1]. In particular, CV-QKD might be the better choice over short distances. When it comes to long distances, however, the story is different. One of the proposed solutions to improve rate-versus-distance performance is to use noiseless linear amplifiers (NLAs) [2], but a realistic analysis that accounts for non-idealities of existing NLAs is missing. One of the most well-known NLAs is based on quantum scissors (QSs) [3], whose ideal operation relies on the single-photon assumption of its inputs. In this study, we report the exact calculation of the secret key rate for the GG02 protocol [4] that is enhanced by a single QS; see Fig. 1(a). We remove the single-photon assumption in the QS modeling and find regimes of operation where QS-assisted GG02 offers advantages over the conventional GG02 system. Our results imply that the region over which rate enhancement is achieved is limited to the regime of long distances.

© 2017 IEEE

PDF Article
More Like This
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, and Wanyi Gu
AF3D.5 Asia Communications and Photonics Conference (ACPC) 2013

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

Yi-Chen Zhang, Song Yu, and Wanyi Gu
W2A.38 Optical Fiber Communication Conference (OFC) 2014

A Continuous-Variable Quantum Repeater based on Quantum Scissors

Kaushik P. Seshadreesan, Hari Krovi, and Saikat Guha
FTh4A.5 CLEO: QELS_Fundamental Science (CLEO_QELS) 2019

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription