research
Four Photons Shared 750 Secret Bits Each Second
A four-arm, 20-kilometer fiber network supported composable protection against outside and participant attacks.
Summary
A four-arm, 20-kilometer fiber network supported composable protection against outside and participant attacks.
Two engineered photon-pair sources generated four-qubit GHZ states at more than 5,000 fourfold events per second. Distributed across a four-arm star network totaling 20 km of fiber, the setup reached a maximum asymptotic secret-key rate of 750 ± 10 bits per second. From measured rates and errors, the authors infer an 8.7-megabit finite-key lower bound for an optimized 24-hour run if device statistics remain stationary.
Why it matters
A four-arm, 20-kilometer fiber network supported composable protection against outside and participant attacks.
Limits and context
- From measured rates and errors, the authors infer an 8.7-megabit finite-key lower bound for an optimized 24-hour run if device statistics remain stationary.
Key claims
A four-arm, 20-kilometer fiber network supported composable protection against outside and participant attacks.
Qualification: From measured rates and errors, the authors infer an 8.7-megabit finite-key lower bound for an optimized 24-hour run if device statistics remain stationary.
Evidence: source-2026-09-15-018
Sources
- arXiv preprint 2609.13367arXiv · primary research
Corrections
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