Welinq and Sparrow Quantum Partner to Bring Photonic Qubits into Multi-Platform Quantum Clusters

Paris, France | Copenhagen, Denmark – November 10, 2026 – Welinq, the leading quantum networking company building the infrastructure for networked quantum computing, and Sparrow Quantum, a photonic quantum technology company developing quantum processors based on its market-leading deterministic single-photon technology, have signed a Memorandum of Understanding (MoU). The two companies will interface Sparrow Quantum’s photonic qubit and quantum light technologies with Welinq’s quantum networking solutions, in a first deployable cluster of processors.

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Quantum Data Centers will be Modular and Multi-Platform

Scaling quantum computing will not come from a single, ever-larger machine alone. Every qubit platform eventually runs into physical limits on what one device can hold. This is why cloud providers and HPC centers are increasingly looking at flexible architectures, in which several quantum processors, even from different platforms, are interconnected and operate as a unified one.

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This modular approach scales computing power by adding quantum processors rather than building ever-larger ones. And because no single qubit technology will fit every use case, quantum computing will not be winner-takes-all. A heterogeneous infrastructure lets each workload run dynamically on the processors best suited to it.

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There is a more fundamental reason why modularity matters. A growing body of research, including Welinq’s latest results, shows that distributed architectures make quantum error correction easier, by spreading logical qubits across entangled processors. Mid-sized processors and networks that meet the required performance thresholds can be combined to reach a large scale much faster. The road to fault tolerance runs through the network.

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From Individual Quantum Processors to Quantum Clusters

Networked, multi-platform quantum computing is at the core of Welinq’s roadmap. Welinq aggregates quantum processor providers from different modalities around joint development initiatives and builds the network that turns their machines into a single cluster: an optical network, qubit-photon interfaces and a software stack for orchestration and distributed error correction.

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Clusters also change how quantum computing gets deployed. Rather than betting on a single machine, a data center can start with the quantum processors available today and add capacity as demand grows. For hardware providers, each cluster means deploying several systems instead of one. And Welinq is set to deploy and operate these clusters for data centers, giving endusers simple access to the combined computing resources without having to manage the underlying hardware.

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Photonics, A Natural Fit for Welinq Clusters

Sparrow Quantum brings photonics into the cluster, a modality that fits naturally: photonic qubits are carried by light, the very medium Welinq’s network uses to connect processors. The company’s deterministic single-photon sources deliver photons on demand with exceptional purity and indistinguishability and are already used by quantum computing companies and research labs across Europe.

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Under this agreement, the companies will interface, integrate and scale Sparrow Quantum’s photonic processors within Welinq’s quantum clusters, deployed on premises in HPC centers and data centers, and available via the cloud.

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Welinq is building interconnected, secure quantum infrastructure, and Sparrow Quantum is among the first platforms to join. Together, the two companies are powering the next generation of computing. By bringing together complementary European expertise, partnerships like this strengthen Europe’s ability to develop and deploy the critical technologies underpinning future quantum computing infrastructure.

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"Quantum computing will not be defined by a single winning qubit technology, but by our ability to connect complementary ones into scalable systems” says Tom Darras, CEO and co-founder of Welinq. "Partnering with Sparrow Quantum is a concrete step in building that infrastructure. Together, we are bringing photonics into the modular, heterogeneous quantum clusters Welinq is developing for data centers."

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“The future of quantum computing will not be defined by individual processors alone, but by how we connect them into larger, more powerful systems,” says Peter Lodahl, CEO of Sparrow Quantum. “At Sparrow Quantum, we are developing photonic processors built on our technology for generating quantum light on demand. Our partnership with Welinq is an important step toward integrating these processors into larger quantum computing systems, and demonstrates how European companies can combine their strengths to build the next generation of quantum computing infrastructure.”

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‍About Welinq

Welinq is a quantum networking company that builds the networking layer required for scalable quantum computing. It develops and commercializes full-stack interconnect systems that aggregate quantum processors from multiple providers and deploys them as clusters in data centers.

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Welinq is a spin-out from Sorbonne Université, CNRS and PSL University, founded in 2022 by Tom Darras, Prof.Julien Laurat and Dr. Eleni Diamanti.

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For more information, visit www.welinq.fr.

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About Sparrow Quantum

Sparrow Quantum is a quantum computing technology company building the photonic platform for fault-tolerant quantum computing and connected quantum systems. Its semiconductor technology generates quantum light on demand, providing a foundation for both computing with photons and connecting quantum processors through light.

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Building on its commercially available photon sources and systems, Sparrow is developing photonic quantum  technologies to enable more powerful, scalable quantum computers.

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Headquartered in Copenhagen, Denmark, Sparrow Quantum builds on more than 25 years of pioneering research at the Niels Bohr Institute.

Learn more at www.sparrowquantum.com.

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