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Falqon® MDI-QKD Series The technological foundation of Quantum Secure Networks (QSN)

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MDI-QKD Designed for Network Scale

Measurement-Device-Independent Quantum Key Distribution (MDI-QKD) enables secure, scalable and resilient quantum key distribution across multiple users and locations through an intrinsic network architecture designed for operational deployment.

Network-First Architecture

Built for operational Quantum Secure Networks (QSN)

MDI-QKD is a QKD architecture in which quantum measurements are performed at a center hub station that does not need to be trusted. Quantum entanglement ensures secret key material is never present there. Moreover, this architecture removes all detector side-channel vulnerabilities from the security model, naturally supports multiple QKD nodes and provides a powerful foundation for scalable QSN. Falqon® has engineered MDI-QKD into a network-first architecture designed for operational deployment.

Intrinsic Network Architecture

Supports hub-and-spoke, ring and advanced network topologies, enabling multi-node Quantum Secure Networks (QSN) rather than isolated point-to-point links.

Enhanced Security

MDI-QKD fundamentally removes detector-side channel attacks from the security model while enabling quantum key generation.

Cost-Effective Scalability

New QKD locations require only a single fiber connection to a Center Hub, without deploying pair-wise connections to every location. Lightweight QKD End Nodes simplify deployment while reducing hardware complexity as the network expands.

Operational Resilience

Supports resilient Quantum Secure Networks (QSN) through redundant Center Hubs, path diversity and dynamic routing, helping eliminate single points of failure.

Design For Evolution

Designed to evolve alongside quantum repeaters, quantum processors, quantum computers and future quantum networking technologies.

System Hardware

The Falqon® MDI-QKD components

  1. 1MQT4000 QKD End Node
    Quantum key generation: Generates quantum keys and securely delivers them to connected cryptographic applications through the embedded Falqon® Key Management System.
  2. 2MQX4000 Center Hub
    Quantum network connectivity and measurement: Performs the central quantum measurements required for MDI-QKD while securely connecting multiple QKD End Nodes without accessing secret key material.
  3. 3MQS4000 Quantum Optical Switch
    Dyanmic quantum optical routing: Dynamically routes quantum signals across shared fiber infrastructure, enabling flexible network topologies, resilient routing and scalable network expansion.

Network capabilities

Engineered for operational networks

  • Built for Telecom-Grade Deployment:Engineered for integration into operational communication infrastructure, enabling telecom operators to deploy QKD as a Service.
  • Scalable Multi-Node Connectivity: Enables multiple QKD end nodes to connect through a shared Center Hub infrastcuure, without the need for pairwise fiber connections.
  • Standards-Based Interoperability: Integrates with existing network security infrastructure through ETSI QKD 004, 014 and 020, SKIP integration across MACsec, IPsec and OTNsec.
  • Dynamic Network Expansion: Add users and locations without redesigning the existing network infrastructure. 
Explore Falqon® Domain Controller
Sovereign by Design

Designed, developed and manufactured in Europe, the Falqon® MDI-QKD Series provides European technology for sovereign Quantum Secure Networks (QSN) across national, critical and cross-border communication infrastructures.

Success Stories – Deployment & Use Cases

Proven in the field, built for deployment

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News and PressMar 2026Ireland’s quantum leap – Walton Institute at SETU and Q*Bird deploy Ireland’s first QKD network with expandable architecture!Delft, 23 March 2026 – Q*Bird, the Dutch leader in quantum secure communication, in collaboration with the Walton Institute at South East Technological…News and PressOct 2025UPM installs Q*Bird MDI QKD Falqon® Series – Paving Spain’s first multi-node MDI QKD network!Delft – We are excited to share Universidad Politécnica de Madrid (UPM) has successfully installed Q*Bird’s MDI QKD Falqon® Series system, a major…News and PressJun 2025Fortifying Europe’s quantum communication – Q*Bird and BeQCI achieve the first cross-border MDI QKD link in BeneluxDelft, 05 June 2025 – In collaboration with Q*Bird, the BeQCI consortium (comprising Belnet, imec, Ghent University among others) and the Luxembourg QCI…
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