Sparkle and Hellas Sat achieve quantum-safe satellite first

A first for Greece and Cyprus

Sparkle and Hellas Sat have announced a working quantum-safe connection running over a satellite link, rather than fibre in the ground. The deployment connects Sparkle’s data centre in Metamorfosis, just outside Athens, with Hellas Sat’s infrastructure in Cyprus, covering a round trip of roughly 72,000 kilometres once the uplink to the geostationary satellite and the downlink back to Greece are accounted for.

It builds directly on groundwork the two companies laid earlier this year, when they validated a quantum-safe IPsec connection between two data centres inside Greece. That earlier test proved the concept on solid ground. This one proves it works when the signal has to leave the atmosphere and come back again, a considerably harder engineering problem given the distance and latency involved.

The technology doing the work is Sparkle’s Quantum Safe Interconnect, or QSI, a software-based platform built to guard against so-called “store now, decrypt later” attacks, where an adversary captures encrypted traffic today in the expectation that quantum computers will eventually be powerful enough to break it. QSI handles this through quantum-safe key delivery and automated key rotation, and because it runs in software rather than requiring dedicated hardware at every node, Sparkle can roll it out across multi-site environments without ripping out existing network infrastructure.

Antonella Sanguineti, Sparkle’s Head of Networking, Cloud, Security & Identity Solutions, said the satellite extension shows the platform holds up outside a single environment. “It demonstrates that QSI can be deployed consistently across different network layers, connectivity domains, and operational environments,” she said, adding that the work opens up ways to protect customers who need secure connectivity across sites that are spread out geographically.

Why satellite links matter to distributed operations

For data centre and enterprise buyers, the satellite element is the part worth paying attention to. Terrestrial fibre links between two data centres are one thing. A secure connection that survives a 72,000km satellite hop is a different proposition entirely, and it opens the door to protecting sites that fibre simply can’t reach efficiently, whether that’s a remote facility, a disaster recovery location, or infrastructure supporting mission-critical operations in areas with limited ground connectivity.

Constantinos Kassianides, Director of Ground Operations at Hellas Sat, framed the result as a step towards something commercially usable rather than a pure lab exercise. “By combining our satellite infrastructure with Sparkle’s QSI solution, we can now evaluate the commercial deployment of quantum-safe satellite services for enterprise customers operating across distributed, remote, and mission-critical locations,” he said. Hellas Sat brings three geostationary satellites and two teleport facilities spanning Greece and Cyprus to the partnership, giving the pairing a physical footprint that few rivals in the region can match.

Part of a wider quantum-safe strategy

The Greece-Cyprus milestone doesn’t stand alone. It’s the latest instalment in a security push Sparkle has been building for the best part of a year, alongside its quantum-safe framework for AI agent communication, STLS-AI, unveiled at the Global NaaS Event in Dallas and due for commercial release before the end of 2026. Sparkle has also been layering AI and cloud services onto its network more broadly, including its reseller agreement to bring Anthropic’s Claude models to European enterprises via Amazon Bedrock, and its partnership with Xebia to speed up AWS cloud adoption across nine European markets.

Taken together, the pattern is consistent. Sparkle isn’t just adding capacity to its network, it’s trying to make security a differentiator across every layer of it, from subsea cables like GreenMed in the Mediterranean down to satellite links serving harder-to-reach markets. That strategy is playing out against the backdrop of Sparkle’s own ownership transition, with its sale to Italy’s Ministry of Economy and Finance and Retelit still awaiting US regulatory clearance. Whatever the outcome there, the quantum-safe roadmap looks set to continue, with cross-border activity already running in several countries beyond this latest Greece-Cyprus deployment.

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