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

被引：1

作者：

Guarda, Giulia ^{[1
,2
]}

Ribezzo, Domenico ^{[2
,3
]}

Salvoni, Daniela ^{[4
]}

Bruscino, Ciro ^{[3
]}

Ercolano, Pasquale ^{[3
]}

Ejrnaes, Mikkel ^{[5
]}

Parlato, Loredana ^{[3
,6
]}

Zhang, C. ^{[4
]}

Li, H. ^{[7
]}

You, L. ^{[7
]}

Vagniluca, Ilaria ^{[8
]}

De Lazzari, Claudia ^{[8
]}

Occhipinti, Tommaso ^{[8
]}

Pepe, Giovanni P. ^{[3
,6
]}

Zavatta, Alessandro ^{[3
,8
]}

Bacco, Davide ^{[3
,9
]}

机构：

[1] European Lab Nonlinear Spect LENS, I-50019 Sesto Fiorentino, Italy

[2] CNR INO, I-50125 Florence, Italy

[3] Univ Napoli Federico II, Dept Phys, I-80125 Naples, Italy

[4] Photon Technol Zhejiang Co Ltd Jiashan, Jiashan 314100, Zhejiang, Peoples R China

[5] Inst Supercond Innovat Mat & Devices CNR SPIN, I-80078 Pozzuoli, Italy

[6] Ist Nazl Ottica Consiglio Nazl Ric CNR SPIN, I-80126 Naples, Italy

[7] Chinese Acad Sci, SIMIT, Shanghai 200050, Peoples R China

[8] QTI Srl, I-50125 Florence, Italy

[9] Univ Firenze, Dept Phys & Astron, I-50019 Florence, Italy

来源：

QUANTUM COMPUTING, COMMUNICATION, AND SIMULATION IV | 2024年 / 12911卷

基金：

欧洲研究理事会;

关键词：

Quantum key distribution; QKD; superconducting nanowire single-photon detectors; SNSPD; quantum cryptography; quantum communications; single-photon detection;

D O I：

10.1117/12.3003698

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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 single-photon 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.

引用

页数：6

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