Quantum

Field demonstration of a self-contained 10 km mobile-to-ground quantum network node via common-aperture co-propagation

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Briefings

A field demonstration successfully integrated a 10 km mobile-to-ground quantum network node using a common-aperture system. The setup simultaneously conducted decoy-state BB84 QKD at 803 nm and bidirectional classical communication at 640/660 nm. Key metrics include a secret key rate of 644 bps, a QBER of 2.512%, and a classical packet error rate of ~0.4% with hardware-based retransmission. The system transmitted real-time AES-256 encrypted images, proving feasibility for jam-resistant mobile quantum networks.

Key points

• The study achieved a secret key rate of 644 bps using rate-adaptive LDPC codes over a 10.31 km terrestrial link.
• The system demonstrated real-time AES-256 encrypted image transmission over the co-aligned classical optical channel.

Context

This represents the first field demonstration of a fully integrated common-aperture architecture where classical and quantum links operate simultaneously over a 10 km atmospheric channel, marking a significant step toward practical mobile quantum networks.

Limitations

The evidence is a preprint (arXiv:2610.27427v1) and does not include peer review or independent verification. The 0.4% packet error rate is an estimated value based on hardware performance, and the study focuses on a single 10 km link configuration.

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