Q

QphoX

Quantum modem enabling microwave-optical quantum links

Overview

QphoX develops a quantum modem device to connect quantum computers over a quantum network. Its core technology is a quantum transducer that couples microwave photons from quantum processors with optical telecom photons through a mechanical intermediary resonator, enabling conversion of quantum information between the microwave (processor) domain and the optical (fiber) domain. This design helps reduce transmission loss and raises fidelity when sending quantum states between nodes. The device acts as a bridge between superconducting or other microwave-based quantum hardware and optical networks, providing a hardware-first solution for building scalable quantum networks. Compared with other approaches, QphoX emphasizes explicit microwave-to-optical conversion via a mechanical resonator to enable more reliable long-distance quantum communication, aiming to accelerate the realization of a practical quantum internet.

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About QphoX

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Industries

HardwareIndustrial & Manufacturing

Company Size

11-50

Company Stage

Grant

Total Funding

$14.6M

Headquarters

Delft, Netherlands

Founded

2021

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Funding

Total Funding

$14.6M

Above

Industry Average

Funded Over

4 Rounds

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Benefits

  • Employee Stock Purchase Plan
  • Performance Bonus
  • Paid Holidays

Company News

The Quantum Insider
Aug 26th, 2026
Quantum Datacenter Alliance announces second annual forum on scaling Quantum Computing.

Quantum Datacenter Alliance announces second annual forum on scaling Quantum Computing. Insider Brief * The Quantum Datacenter Alliance will hold its second international forum Oct. 1 in London, bringing quantum and data center leaders together to address the challenges of building utility-scale distributed quantum computers. * The forum will focus on system-level issues including quantum processors, networking, error correction, interoperability, middleware, software, algorithms and integration with classical computing infrastructure. * Speakers will include executives and technical leaders from Atom Computing, QuEra, NVIDIA, IBM, Q-CTRL, Nu Quantum, Quantinuum and other organizations across the quantum computing ecosystem. PRESS RELEASE - The second international Quantum Datacenter Alliance (QDA) Forum will be held on October 1, 2026 at Battersea Power Station in London. This exclusive-access event brings together technical and business leaders from across the quantum and classical networking industries with a shared mission: accelerating the timelines to reach utility-scale distributed quantum computing. Nu Quantum, Cisco, NTT Data, OQC (Oxford Quantum Circuits), QphoX, Quantinuum and QuEra established the QDA in 2025 with the mission of bringing together leading voices from the quantum computing and data center communities to address one of the field's most pressing bottlenecks: how to integrate emerging quantum hardware into existing and future data center infrastructure. As quantum systems move from lab-scale demonstrations toward commercial deployment, questions about system-level architecture, control, error correction, interoperability and power consumption have become as critical as the qubits themselves. "Cross-industry collaboration is essential to delivering utility-scale quantum computers," said Carmen Palacios-Berraquero, CEO of Nu Quantum. "The QDA provides a vital space for the leading companies in our ecosystem to exchange ideas and accelerate the progress needed to make this technology a reality." The one-day event will focus on a single question: how to build datacenter-scale quantum computers and accelerate the timeline to fault-tolerance. Sessions will cover the full computing stack (quantum processors, interconnects, entanglement networks, middleware, system integration, software, algorithms, and applications), reflecting the QDA's premise that no single organization can solve this alone. The day's speakers include: * Dame Wendy Hall, Regius Professor at the University of Southampton and the inventor of Microcosm, the precursor to the World Wide Web * Dr. Ben Bloom, CEO of Atom Computing * Dr. Alexei Bylinskii, VP of Quantum Computing Services, QuEra Computing * Dr. Anna Tatarczak, Distinguished Member of Technical Staff at Coherent Inc., specializing in next-generation data center interconnects * Andy Grant, EMEA Director, Supercomputing, Higher Education, and AI at NVIDIA * Jim Sexton, Fellow at IBM * Michael Hush, Chief Scientist at Q-CTRL * Dr. Carmen Palacios-Berraquero, CEO of Nu Quantum * Dr. Karmela Padavic-Callaghan, journalist covering physics, materials science and quantum technology at New Scientist * Seyon Sivarajah, Chief Architect for Developer Tools at Quantinuum Registration for the Forum is open, but capacity at the venue is limited. The QDA is curating the attendee list to facilitate the kind of close, cross-disciplinary exchange that a smaller room makes possible: prioritizing depth of expertise and diversity of perspective across the quantum networking stack. Robert Stockill, CTO at QphoX, said: "With so many pioneers in quantum data centre design and implementation gathered at the QDA Forum, we have a unique chance to understand the very edge of technological advancement in scalable quantum computing, and stimulate the next round of innovation in these powerful and rapidly evolving systems." "Realizing the full potential of quantum technology and its role in the future of compute involves deploying it directly into AI data centers to operate in hybrid capacities alongside classical HPC environments," said Dr. Jennifer Strabley, Corporate Vice President and General Manager of the Compute Platform Group at Quantinuum. "This global alliance provides the collaborative foundation necessary to address the system-level challenges required to accelerate scalable interoperability in alignment with the public and private sector leaders across the ecosystem." To register your interest, explore membership opportunities or stay up to date with the QDA's latest activities, visit qda.global. Matt Swayne. With a several-decades long background in journalism and communications, Matt Swayne has worked as a science communicator for an R1 university for more than 12 years, specializing in translating high tech and deep tech for the general audience. He has served as a writer, editor and analyst at The Quantum Insider since its inception. In addition to his service as a science communicator, Matt also develops courses to improve the media and communications skills of scientists and has taught courses. [email protected] Stay Ahead of Quantum Get the latest research, company news, and market intelligence every week. MENTIONED IN THE ARTICLE

Quantum Computing Report
Nov 21st, 2025
QphoX Receives €10M EIC Investment

QphoX, a quantum hardware developer, has secured a €10 million ($11.5 million) equity investment from the European Innovation Council's STEP Scale-Up scheme. This funding will support QphoX's efforts to enhance quantum computing solutions in Europe. The company was one of eight selected from 51 proposals. The STEP Scale-Up scheme aims to bridge market gaps by providing investments between €10 million and €30 million to facilitate financing rounds of €50 million to €150 million or more.

IO+
Sep 19th, 2025
Quantum startup QphoX wins $5.8M U.S. Air Force Contract

The project will integrate Rigetti's superconducting microwave qubits with QphoX's single-photon microwave-optical transducers.

Tech.eu
Feb 26th, 2025
Welinq And Qphox To Tackle Quantum Computing'S Scaling Problem

Quantum startups Welinq and QphoX have announced a partnership to increase computing power by developing optical quantum interconnects for superconducting quantum computers. These interconnects will link quantum processors, allowing them to work together in clusters - a major step toward building larger, more powerful quantum systems.Welinq is a company focused on enhancing quantum computing by developing solutions that connect quantum processors, thereby boosting their computational capabilities and enabling remote quantum access. Their approach involves creating "quantum links" that utilise photons synchronized by quantum memories to establish entanglement between separate Quantum Processing Units (QPUs).Additionally, Welinq's technology aims to improve error correction in quantum computing. By linking QPUs through their quantum memories, they facilitate advanced error-correction strategies, addressing hardware imperfections that can lead to computational errors.QphoX specializes in developing innovative networking solutions to address scaling challenges in quantum computing, notably through their quantum transduction technology that enables coherent conversion between microwave and optical signals. This technology facilitates the networking of superconducting quantum processors by bridging the gap between different frequency domains, thereby enhancing connectivity and parallelisation.By partnering with QphoX, Welinq integrates their expertise in quantum interconnects and quantum memories with QphoX's transduction technology. This collaboration would aim to create seamless optical quantum interconnects for superconducting quantum computers, enabling efficient networking of multiple quantum processing units (QPUs)

Quantum Zeitgeist
Feb 25th, 2025
Welinq And Qphox Partner To Boost Quantum Computing Scalability With Optical Interconnects

Their collaboration combines Welinq's interconnection systems with QphoX's transduction technologies to address scalability challenges in quantum computing.

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