Airbus Defence and Space has demonstrated a tactical communications network secured by both post-quantum cryptography (PQC) and quantum key distribution (QKD), linking military and law enforcement users during a live field trial in Malta on September 10 and 11, 2026. Airbus, which disclosed the results on October 5, says the self-funded trial marked the first time a quantum-secure tactical network connected both communities across different operational networks.
In a harvest-now, decrypt-later attack, an adversary stores intercepted traffic until a cryptographically relevant quantum computer can break the RSA and elliptic-curve key exchanges protecting it. Estimates for that machine keep falling: in May 2025, a Google Quantum AI researcher calculated that a 2048-bit RSA key could be factored in under a week with fewer than one million noisy qubits, against 20 million in his own 2019 estimate. The US National Security Agency (NSA) requires new national security system acquisitions to support its quantum-resistant CNSA 2.0 suite from January 1, 2027, while the European Union’s roadmap, adopted June 23, 2025, sets end-2030 as the PQC deadline for high-risk use cases.
How Airbus Built a Hybrid Quantum Key Distribution Architecture
Airbus layered two defenses. PQC replaces vulnerable public-key mathematics with algorithms designed to resist both classical and quantum attack, the family the US National Institute of Standards and Technology (NIST) standardized in August 2024 as FIPS 203, 204 and 205. QKD takes a physical approach: keys are encoded on single photons, so any interception disturbs their quantum states and becomes detectable. Airbus ran both across multiple nodes.
Each partner supplied a defined layer. Stormshield, a wholly owned Airbus Defence and Space subsidiary whose Stormshield Network Security (SNS) gateways already hold NATO Restricted and EU Restricted approvals, provided the network encryptors. QKD hardware came from Telsy, the cryptography arm of Italy’s TIM Enterprise, through its Florence-based subsidiary Quantum Telecommunications Italy (QTI), a 2020 spin-off of Italy’s National Research Council. Maltese firm Merqury Cybersecurity supplied the key management system (KMS) and software-defined networking (SDN) layer that orchestrated keys and routing across the network. Telecom operator Melita provided the fiber.
Malta hosts PRISM, its national contribution to the European Quantum Communication Infrastructure (EuroQCI), which has built a QKD testbed on Melita’s commercial fiber with Merqury as a core technical partner. In May 2026, Melita and Merqury ran a QKD link between Melita’s two main data centers over live dense wavelength division multiplexing (DWDM) traffic, removing the need for dedicated dark fiber.
Airbus has not disclosed which PQC algorithms it implemented, how many nodes or users took part, which organizations participated, or what latency and key generation rates the network sustained. Those figures will decide whether the architecture scales.
How Agnet Carries Post-Quantum Security to the Tactical Edge
At the center of the trial sat Agnet, Airbus’s mission-critical collaboration platform. Originally marketed as Tactilon Agnet, it is a software-based service built on Third Generation Partnership Project (3GPP) mission-critical standards, delivering push-to-talk voice, multimedia messaging, live video and location sharing across smartphones, tablets, radios and laptops. Its hybrid design bridges broadband networks and legacy narrowband systems including TETRA, Tetrapol, DMR and P25, the property that lets users on separate networks work together. Airbus has previously packaged it into Manpack, a portable LTE tactical bubble aimed at special operations forces.
That interoperability is the operational point. Joint military and police missions, from border security to counterterrorism and critical infrastructure protection, depend on gateways that join networks running different encryption regimes, and every gateway is a seam. Airbus says it embedded quantum-resistant encryption directly into Agnet, arguing that systems already in service can be upgraded in place. The company also describes the trial as spanning active multi-domain networks, without specifying the bearers involved.
The released material does not map which technology protected which segment, but physics narrows the answer. QKD needs a dedicated optical channel, usually fiber, and trusted relay nodes over longer distances. It cannot reach a handset in a vehicle or a radio in a rucksack. The most plausible architecture therefore uses QKD to supply keys on fixed fiber links between core nodes, with PQC protecting the wireless last mile to end-user devices. That division matters: a quantum-secure backbone is only as strong as the edge links that feed it.
Why Quantum Security Is Becoming a Defense Procurement Requirement
The Malta trial sits inside a broader industrial race. Airbus led the consortium the European Commission selected on May 31, 2021, to design the EuroQCI architecture, and it is building the Noordwijk optical ground station for EAGLE-1, the SES-led satellite demonstrator for space-based QKD. In the UK, Babcock International and Arqit demonstrated software-defined quantum-safe encryption across 4G/5G, satellite and mobile ad hoc network bearers at the DVD 2026 exhibition at Millbrook, without inline hardware encryptors. Arqit’s approach is software-only; Airbus mixes software PQC with QKD hardware.
That difference maps onto an open policy dispute. In January 2024, France’s ANSSI, Germany’s BSI, the Netherlands’ NLNCSA and the Swedish Armed Forces’ communications security authority jointly concluded that QKD requires dedicated infrastructure, carries significant functional limitations, suits only niche use cases and lacks sufficient security maturity. They urged priority for PQC. The NSA has likewise declined to endorse QKD for national security systems, and CNSA 2.0 specifies ML-KEM-1024 and ML-DSA-87, both pure PQC algorithms. The Airbus hybrid reads as a response to that critique: in a properly combined design, an attacker must defeat both layers to recover a key.
Communications security is only one front. The Pentagon’s Defense Innovation Unit runs the Transition of Quantum Sensing (TQS) program, under which Lockheed Martin is prototyping a quantum-enabled inertial navigation system (QuINS), while Honeywell and SandboxAQ are developing quantum magnetometer navigation for GPS-denied operations, a direct response to the satellite navigation jamming now routine over Ukraine and the Baltic. Quantum computing, the third pillar, is why the cryptographic transition is needed at all.
Analysis: The Malta trial does not settle whether QKD belongs in military networks, but it shows where the European defense industry is placing its bet: cryptographic agility built into platforms already in service. The binding constraint for armed forces is installed base, not physics. Every fielded radio, terminal and gateway carrying long-life secrets must migrate before the EU’s 2030 deadline, while the NSA’s 2027 acquisition rule shapes what allied vendors can sell into US programs. A supplier able to upgrade fielded systems through software, while offering QKD for fixed backbones where governments want it, gains an edge in tenders on both sides of the Atlantic. Every disclosed partner is European, which fits the EuroQCI sovereignty agenda. The open variable is accreditation: Airbus has not said whether any national authority has evaluated the architecture for classified traffic.
The next markers are procedural. EU member states must have national PQC transition plans by December 31, 2026, and Malta’s PRISM network is planned to extend to Sicily over Melita’s undersea cable. For Airbus, the questions are whether a government customer funds a follow-on pilot, which PQC algorithms Agnet will ship with, and whether the quantum-enabled Stormshield configuration earns the NATO and EU approvals the current SNS line holds. Until then, the Malta trial remains a validated architecture, not a fielded capability.