Arqit Quantum Inc is a cybersecurity company that has pioneered a symmetric key agreement technology which makes the communications links of any networked device or data at rest secure against current and future forms of cyber attack - even an attack from a quantum computer. Arqit delivers its symmetric key agreement technology via its QuantumCloud. Its product, QuantumCloud, enables any device to download a lightweight software agent, which can create keys in partnership with any other device. The firm operates in one segment that is, the provision of cybersecurity services via satellite and terrestrial platforms. Key revenue comes from the UK.