Welinq Secures First Sale of its Entangled Photon Pair Source

A core photonic component of Welinq’s quantum networking solutions is now commercially available.

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February 4^th, 2026 – Paris, France – Welinq, a leader in quantum networking technology, today announced the commercial launch of its high-performance, rack-mounted Entangled Photon Pair Source. The company has also sold and delivered its first unit to a leading European institution. This milestone marks a pivotal step forward in the development of quantum infrastructure, providing businesses and research institutions with an integration-ready solution.

The advancement of quantum technologies depends on the ability to generate and distribute entanglement at scale across quantum networks. Welinq’s Entangled Photon Pair Source addresses this challenge by delivering the critical technology required to reliably generate entangled photons for secure communications and quantum computer interconnects. Designed for compatibility with a wide range of quantum technologies, including multiple quantum computing modalities, this flexibility positions Welinq’s source as a core building block for next-generation, scalable, high-performance quantum infrastructures.

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Tom Darras, CEO and co-founder of Welinq, commented: “With this sale, we are not only demonstrating the viability of our technology, but also its strategic importance in building the quantum infrastructures of tomorrow. Our vision is to provide a complete networking solution for quantum-augmented data centers and quantum-safe networks, and this commercial source is a vital piece of that puzzle.”

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A High-Performance, Integration-Ready Photonic Solution

Welinq’s Entangled Photon Pair Source delivers a unique combination of performance, stability, and cross-platform compatibility, making it a foundational component of quantum networks. Designed for deployment within existing fiber infrastructures, it enables the reliable generation of entanglement required for quantum-safe networks and quantum-augmented data centers.

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Key features include:

• High-performance photon generation: delivers high-quality heralded single photons and entangled photon pairs. The product uniquely combines narrowband emission with linewidths ranging from 2 to 20 MHz, ideal for interfacing with atomic-based quantum technologies, along with dual-wavelength output: one photon in the telecom C-band for low-loss fiber transmission, and the other at a visible wavelength optimized for coupling to atomic systems.

• Robust, integration-ready design: housed in a compact 19-inch industrial rack-mount form factor and engineered for continuous operation at room temperature, ensuring straightforward deployment in existing photonic and data-center environments.

• Full-stack compatibility: developed as a core element of Welinq’s end-to-end quantum networking solution, the source’s properties are engineered to operate directly with Welinq’s commercially available QDrive quantum memories. This enables the creation of high-performance quantum nodes and interconnects. Beyond quantum memories, the source integrates with Welinq’s broader technology portfolio, including advanced software solutions for algorithm partitioning and high-performance qubit-photon interfaces across multiple quantum computing platforms making it a key component of a complete, scalable quantum networking system.

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A Second Commercial Milestone for On-Prem Quantum Networks

With the recent commercial delivery of its quantum memory to SkQCI and the newly launched entangled photon pair source, Welinq now provides multiple interoperable core components required to deploy operational quantum networking systems directly on customer premises. These technologies are no longer confined to laboratory demonstrations, but are being delivered as engineered, production-ready modules to end users.

This second commercial milestone confirms strong market validation of Welinq’s technology portfolio in Europe. By addressing concrete deployment needs across research and industrial customers, Welinq is establishing itself as a leading European provider of quantum networking infrastructure, while actively expanding its commercial footprint into international markets, including the USA and Asia.

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About Welinq

Based in Paris, Welinq is pioneering in the industrialization of quantum infrastructure, offering solutions that extend beyond individual hardware components. With a full technology stack spanning software solutions for algorithm partitioning and a suite of quantum hardware, including photon pair sources, quantum memories, and qubit-photon interfaces, Welinq addresses the comprehensive needs of quantum data centers and secure networks. A spin-off from Sorbonne University, CNRS, and PSL University, Welinq was founded in 2022 by Tom Darras, Julien Laurat, and Eleni Diamanti.

Learn more about Welinq at www.welinq.eu  

Press Contact: info@welinq.fr

© Agence Oblique | Alexis Anice for the picture

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