Arqit announces QuantumCloud integration with major European telecoms operator
Arqit Quantum Inc
Symmetric key agreement for quantum-safe encryption at cloud scale
Registered: United Kingdom | Offices: United Kingdom, United States
About Arqit Quantum
Arqit was founded in London in 2017 with a specific technical premise: that the key exchange problem, not the encryption algorithm, represents the most critical vulnerability in classical cryptographic infrastructure. PKI-based key distribution relies on the difficulty of factoring large integers or solving the discrete logarithm problem. Both assumptions break under a sufficiently powerful quantum computer.
The company's response is QuantumCloud, a platform that generates symmetric encryption keys directly on endpoint devices without transmitting the keys themselves over any network. The process uses a combination of satellite-distributed entropy, classical one-time-pad-style distribution, and a proprietary symmetric key agreement protocol. The result is that two devices can establish a shared secret without any key material ever crossing a network boundary, removing the classical interception risk entirely.
QuantumCloud is available as a software platform, which means it does not require QKD hardware deployment at the enterprise level. Customers integrate via SDK or API. The platform targets critical national infrastructure, defence communications, financial services, and government networks where long-term secrecy requirements make the harvest-now-decrypt-later threat model immediately relevant.
Arqit listed on the Nasdaq in 2021 via SPAC merger. The company has since shifted focus from satellite-delivered quantum entropy toward software-defined symmetric key agreement, broadening its addressable market substantially. As of early 2026, the platform operates across multiple national jurisdictions. Partnership activity includes telecoms operators and defence prime contractors in Europe and North America.
Use Cases
Quantum-Safe Government Communications
Government and defence organisations face a specific version of the long-term secrecy problem. Documents classified today may still require protection in 2035 or beyond, well within the projected operational window of cryptographically relevant quantum computers. QuantumCloud provides a migration path that does not require ripping out existing network infrastructure: the SDK wraps existing communications channels with a symmetric key layer, leaving application logic intact.
Critical Infrastructure Protection
Operational technology environments in energy, water, and transport have long refresh cycles. Hardware deployed today will be in service when quantum threats mature. Arqit's software-only approach allows OT operators to add quantum-safe key management to existing SCADA and control systems without hardware replacement, addressing regulatory requirements under the UK's Network and Information Systems Regulations and equivalent EU frameworks.
Financial Services Encryption Migration
Banks and payment processors running TLS-protected transaction flows face compliance timelines from DORA, PCI-DSS, and emerging quantum-specific guidance from national regulators. QuantumCloud supports hybrid deployment, running alongside existing TLS stacks to provide a secondary symmetric layer. This allows staged migration without breaking existing client integrations during the transition period.
Case Studies
Quantum-Safe Connectivity for Critical Infrastructure
Deployment of QuantumCloud across a regulated utility operator.
Hybrid PQC Migration for Financial Services
Phased migration from classical PKI to symmetric key agreement.
Case studies hosted on Arqit's own website. QSECDEF links to primary sources.
In the News
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Frequently Asked Questions
What is Arqit QuantumCloud?
QuantumCloud is Arqit's platform for symmetric key agreement. It generates encryption keys directly on endpoint devices without transmitting key material over any network, removing classical interception risks. The platform is available as a software SDK, meaning it does not require dedicated QKD hardware.
Is Arqit quantum-safe?
Arqit's approach is quantum-safe by design. Rather than relying on mathematical problems that quantum computers can solve (like RSA or ECC), QuantumCloud uses symmetric key agreement, which is not vulnerable to Shor's algorithm. The system addresses the harvest-now-decrypt-later threat model.
Where is Arqit headquartered?
Arqit Quantum Inc is registered in the United Kingdom with headquarters in London. The company also maintains offices in the United States.
What industries does Arqit serve?
Arqit's primary markets include defence and national security, critical national infrastructure (energy, water, transport), financial services, and government communications. The platform targets organisations with long-term secrecy requirements.
Is Arqit a QSECDEF Expert Member?
Yes. Arqit holds Expert Member status within QSECDEF, the quantum security professional community. Expert Members have completed peer review validation and maintain active participation in the QSECDEF expert network.