Decoy-state quantum key distribution over long-distance optical fiber

Giulia Guarda; Domenico Ribezzo; Daniela Salvoni; Ciro Bruscino; Pasquale Ercolano; Mikkel Ejrnaes; Loredana Parlato; C. Zhang; H. Li; L. You; Ilaria Vagniluca; Claudia De Lazzari; Tommaso Occhipinti; Giovanni P. Pepe; Alessandro Zavatta; Davide Bacco

doi:10.1117/12.3003698

13 March 2024 Decoy-state quantum key distribution over long-distance optical fiber

Giulia Guarda, Domenico Ribezzo, Daniela Salvoni, Ciro Bruscino, Pasquale Ercolano, Mikkel Ejrnaes, Loredana Parlato, C. Zhang, H. Li, L. You, Ilaria Vagniluca, Claudia De Lazzari, Tommaso Occhipinti, Giovanni P. Pepe, Alessandro Zavatta, Davide Bacco

Author Affiliations +

Proceedings Volume 12911, Quantum Computing, Communication, and Simulation IV; 129110D (2024) https://doi.org/10.1117/12.3003698
Event: SPIE Quantum West, 2024, San Francisco, California, United States

Abstract

Today’s society heavily relies on secure communications, which can be guaranteed by Quantum Key Distribution (QKD), the most mature quantum technology. However, achieving long-distance links without relying on trusted nodes is still challenging. An important limitation is the non-ideality of detection systems, where intrinsic dark counts can hinder key extraction. This work proposes using state-of-the-art superconducting nanowire singlephoton detectors (SNSPD) with ultra-low dark count rates (<1 Hz) to reduce the quantum bit error rate (QBER) and achieve a higher secret key rate. Together with a high-rate QKD transmitter and a self-stabilizing receiver, we enabled a key exchange over 55 dB, corresponding to 340 km over an ultra-low-loss optical fiber.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Giulia Guarda, Domenico Ribezzo, Daniela Salvoni, Ciro Bruscino, Pasquale Ercolano, Mikkel Ejrnaes, Loredana Parlato, C. Zhang, H. Li, L. You, Ilaria Vagniluca, Claudia De Lazzari, Tommaso Occhipinti, Giovanni P. Pepe, Alessandro Zavatta, and Davide Bacco "Decoy-state quantum key distribution over long-distance optical fiber", Proc. SPIE 12911, Quantum Computing, Communication, and Simulation IV, 129110D (13 March 2024); https://doi.org/10.1117/12.3003698

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available