Practical Free-Space QKD under Night- and Day-time over a 0.5 km Metropolitan Link

Argiris Ntanos; Aristeidis Stathis; Panagiotis Kourelias; Evridiki Kyriazi; Panagiotis Toumasis; Nikolaos K. Lyras; H. Avramopoulos; Giannis Giannoulis

doi:10.1364/quantum.2025.qw3a.27

January 1, 2025

Practical Free-Space QKD under Night- and Day-time over a 0.5 km Metropolitan Link

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Key Points

The system achieved <6% QBER, showing high performance in both daytime and nighttime settings.
During testing, the QKD system reached secure key rates (SKRs) of up to 1.3 kbps over a 0.5 km distance.
Low-cost optical terminals were utilized, enhancing the practicality of free-space QKD for urban environments.
This approach could help improve secure communications in metropolitan areas, potentially revolutionizing the field.

Implication

A practical free-space QKD system reaches <6% QBER and SKRs of 1.3 kbps over 0.5 km link, indicating effectiveness in varied conditions.

Abstract

A practical Free-Space polarization-encoded QKD system with Low-Cost Optical Terminals is presented, operating over a 0.5 km urban link, achieving <6% QBER and SKRs up to 1.3 kbps in nighttime and daytime conditions.

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Cite This Study

Ntanos et al. (2025) studied this question.

synapsesocial.com/papers/68c19f9c54b1d3bfb60db326 https://doi.org/10.1364/quantum.2025.qw3a.27

View Full Paper

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Practical Free-Space QKD under Night- and Day-time over a 0.5 km Metropolitan Link

Key Points

Implication

Abstract

Discussion

Cite This Study

Practical Free-Space QKD under Night- and Day-time over a 0.5 km Metropolitan Link

Key Points

Implication

Abstract

Discussion

Cite This Study

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