Arqit Invests in Sirius for Quantum-Safe Defence Communications

• •Arqit invests in Sirius to enhance quantum-safe communications for defence.
• •The investment builds on an existing partnership and aims to accelerate product development.
• •The companies will provide secure networking services to NATO and expand into new markets.

On October 20, 2026, Arqit Quantum Inc. announced a strategic investment in Sirius Computer, Inc. to enhance quantum-safe communications for defence and government sectors. This investment builds on their existing partnership, which integrates Sirius's secure networking technology with Arqit's Sovereign Key Platform. The joint offering, Crux, aims to protect sensitive communications across various devices and networks, including mobile and cloud systems. The collaboration is part of a winning consortium to provide secure networking services to NATO, targeting opportunities within NATO member countries and the UK and US defence departments. The investment is expected to accelerate product development and expand into new defence markets. Arqit emphasizes the need for secure communication that facilitates cooperation among allied forces without adding complexity.