Field test of quantum key distribution with high key creation efficiency

Quantum key distribution (QKD) promises unconditional security for communication. However, the random choices of the measurement basis in QKD usually result in low key creation efficiency. This drawback is overcome in the differential-phase-shift QKD, provided that each photon can be prepared in a l...

Full description

Saved in:
Bibliographic Details
Published in:Optics express 2023-09, Vol.31 (19), p.30239
Main Authors: Kao, Yung-Cheng, Huang, Sheng-Hsuan, Chang, Chin-Hsuan, Wu, Chih-Hsiang, Chu, Shih-Hsien, Jiang, Jian, Zhang, An-Chi, Huang, Sheng-Yao, Yan, Jhih-Heng, Feng, Kai-Ming, Chuu, Chih-Sung
Format: Article
Language:English
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Quantum key distribution (QKD) promises unconditional security for communication. However, the random choices of the measurement basis in QKD usually result in low key creation efficiency. This drawback is overcome in the differential-phase-shift QKD, provided that each photon can be prepared in a large number of time slots with a proper waveform. In this work we develop a miniature room-temperature 1550-nm single-photon source to generate narrowband single photon in 50 time slots with a nearly optimal waveform for achieving unity key creation efficiency. By utilizing these single photons in the field test, we demonstrate the differential-phase-shift QKD with a key creation efficiency of 97%. Our work shows that the practical QKD can benefit from the narrowband single photons with controllable waveforms.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.496966