Arqit and Sparkle Demo Quantum-Safe Encryption on Optical Links

📅 December 4, 2025 - Arqit Quantum and Sparkle are claiming an important milestone in the race to secure networks against future quantum attacks, demonstrating that quantum-resistant encryption can be delivered "at the speed of light" over a production-grade optical network.

The two companies have completed a proof of concept in Athens on Sparkle's metropolitan optical ring, showing that Arqit's quantum-safe encryption can be embedded directly into the optical transport layer. Rather than adding security at higher layers or through external appliances, the approach integrates encryption into the physical (L1) layer of Sparkle's network, securing multi-100G optical links without adding noticeable latency or [...][... Check source for end of article ...]

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