Arqit Quantum Makes Strategic Investment In Sirius Computer To Expand Quantum-Safe Defense Communications; No Financial Terms Disclosed

Arqit Quantum Inc. (NASDAQ:ARQQ), a global leader in quantum-safe encryption helping safeguard sensitive information from current and future cyber threats, today announced a strategic investment in Sirius Computer, Inc., a technology provider of secure computing and networking solutions for defence, intelligence and critical national infrastructure. This will accelerate the development and delivery of quantum-safe communications for defence, government and national security users.

The investment builds on an existing partnership that combines Sirius’s secure networking technology with Arqit’s Sovereign Key Platform (SKP) and NetworkSecure™ adaptors to deliver Crux, a software-based connectivity platform. The companies' joint offering protects sensitive communications across devices and networks, helping defence users share information securely in deployed environments, and when operating alongside allied forces.

The software-based offering is designed to run on commercial devices and work alongside existing infrastructure, enabling users to extend secure communications without replacing their underlying networks. Applications include mobile devices, cloud and network systems, autonomous platforms such as Uncrewed Autonomous Vehicles (UAVs) and their associated control systems.

The strategic investment will support the continued development of Crux and Sirius’s broader software and hardware technologies, deeper integration with Arqit's encryption solutions, and the creation of new joint products and services. The companies have been selected as part of a winning bidding consortium to provide secure networking services to NATO. The companies will also expand their joint go-to-market activities, pursuing opportunities across NATO member countries and other allied nations, including the UK Ministry of Defence and US Department of Defense.