Arqit Quantum Unveils Strategic Investment in Sirius Computer

09:57 AM EDT, 10/20/2026 (MT Newswires) -- Arqit Quantum (ARQQ) has made a strategic investment in Sirius Computer, which provides secure computing and networking solutions, according to a Tuesday statement. No financial terms were disclosed. Arqit said the investment is intended to accelerate the development of quantum-safe communications for defense, government and national security customers. The investment builds on the companies' partnership that combines Sirius' secure networking technology with Arqit's Sovereign Key Platform and NetworkSecure adaptors to deliver the software-based Crux connectivity platform, Arqit said. Price: 13.77, Change: -0.25, Percent Change: -1.82