Barcelona, Spain, February 17, 2026 -- LuxQuanta, a Spanish deep-tech company specialising in quantum cybersecurity, has successfully completed a proof of concept (PoC) validating the measurable performance of its continuous-variable quantum key distribution (CV-QKD) system, NOVA LQ, under realistic metropolitan deployment conditions.

The PoC replicated operational parameters representative of MADQCI, the Community of Madrid’s quantum communications infrastructure, allowing LuxQuanta to generate reproducible technical data aligned with real-world network constraints.

Measurable performance under real network conditions

The validation focused on three deployment-critical factors: transmission reach, coexistence with classical traffic, and network scalability.

Key results include:

Stable quantum key distribution over up to 100 km of standard single-mode optical fibre.

Full coexistence with DWDM classical traffic on the same fibre, without the need for dark or dedicated fibre.

Validation in both point-to-point and point-to-multipoint configurations, using one transmitter with multiple receivers.

Demonstrated operational stability under parameters representative of metropolitan fibre loss, noise, and traffic conditions.

By operating alongside conventional optical traffic, NOVA LQ enables quantum security without requiring parallel infrastructure. For telecom and data centre operators, this directly translates into lower deployment costs, reduced complexity, and faster time-to-integration.

Enabling scalable quantum-secure network architectures

The successful validation of point-to-multipoint configurations is particularly relevant for metropolitan and regional deployments. A single transmitter serving multiple receivers reduces hardware duplication and simplifies network architecture, improving scalability economics for operators planning multi-node quantum-secure networks.

The PoC produced reproducible technical data that supports feasibility assessments for future QKD rollouts across:

Metropolitan fibre networks

• Inter-data-centre links
• Government and critical infrastructure backbones
• Protecting critical infrastructure against current and future threats

NOVA LQ integrates quantum key distribution at the physical layer, providing information-theoretic security independent of computational assumptions. This enables protection against:

• Current advanced cyber threats
• “Harvest now, decrypt later” attacks
• Future cryptographic risks introduced by large-scale quantum computers

By validating performance over existing optical infrastructure, LuxQuanta demonstrates that quantum-safe communications can be integrated today, without waiting for network redesigns or fibre overbuilds.

“Our collaboration with MadQuantum Business Venture has allowed us to validate the advanced capabilities of our commercial QKD system, NOVA LQ, under parameters representative of a real metropolitan network such as MADQCI,”

said Vanesa Díaz, CEO of LuxQuanta.

“The data generated in this PoC provides a concrete technical basis for operators and infrastructure owners evaluating scalable quantum-secure deployments on existing fibre networks.”