Insider Brief
- Photonic quantum computing uses photons instead of matter-based qubits, offering room-temperature operation, fiber-network compatibility, and multiple architectural approaches under active development.
- A global group of companies including PsiQuantum, Xanadu, and Quandela are advancing distinct photonic strategies spanning silicon photonics, squeezed light, and single-photon systems.
- Key technical barriers remain around photon loss, deterministic generation, and scalable error correction, with significant investment and government backing accelerating progress toward practical systems.
What is Photonic Quantum Computing?
Photonic quantum computing encodes information in photons, individual particles of light, rather than in superconducting circuits or trapped ions. This approach offers several distinctive properties. Photonic systems can operate at room temperature, avoiding the costly dilution refrigerators required by superconducting qubits. They are naturally compatible with existing fiber optic telecommunications infrastructure, which could simplify networking between quantum processors.
Several different photonic architectures are being explored. Some companies use squeezed light and continuous-variable encoding. Some work with discrete single-photon sources and linear optical gates, while others pursue integrated photonic chips fabricated using semiconductor manufacturing processes.
Each approach comes with its own engineering challenges, particularly around photon loss, deterministic photon generation, and efficient detection. The companies profiled below represent the leading efforts to overcome these hurdles and build practical photonic quantum computers.
11 Photonic Quantum Computing Companies
The following is a non-exhaustive selection of companies developing photonic quantum computers. The quantum photonics landscape is broad and evolving rapidly, and the inclusion or omission of any company should not be interpreted as a ranking or endorsement.
PsiQuantum (United States)
Founded in 2016 and headquartered in Palo Alto, California, PsiQuantum is developing fault-tolerant photonic quantum computers manufactured using standard semiconductor fabrication processes. The company has raised over $2 billion in total funding, including a $1 billion Series E round completed in September 2025, and partners with GlobalFoundries for chip production.
PsiQuantum is building deployment sites in Brisbane, Australia (backed by a $940 million in government support) and Chicago, with systems expected to come online in the coming years. The company focuses on silicon photonics and proprietary error correction schemes optimized for photonic architectures.
Xanadu (Canada)
Xanadu, established in 2017 in Toronto, has raised over $287 million and is one of the most visible photonic quantum computing companies globally. The company develops photonic quantum processors using squeezed light and has demonstrated quantum computational advantage through Gaussian boson sampling experiments.
Xanadu also maintains PennyLane, a widely used open-source quantum machine learning framework. In early 2026, Xanadu announced plans to go public. The company achieved a significant technical milestone in 2025 with its work on GKP (Gottesman-Kitaev-Preskill) states for error correction in photonic systems.
Quandela (France)
Quandela, founded in 2017 and based in Palaiseau near Paris, specializes in single-photon sources and photonic quantum computers. The company has raised over $71 million and has delivered systems to major institutions, including the French Alternative Energies and Atomic Energy Commission (CEA).
Quandela launched its MosaiQ platform, which allows users to access its photonic quantum computers through the cloud. Its BELENOS and CANOPUS systems are also being offered via cloud partnerships. The company produces its own hardware, including semiconductor chips that generate single photons with high efficiency, which are important for reliable quantum computing.
ORCA Computing (United Kingdom)
ORCA Computing, founded in 2019 in Oxford, uses a unique approach to photonic quantum computing called time-domain multiplexing. This method encodes quantum information in the timing of photons, allowing a single optical system to act as multiple quantum modes, which reduces the need for complex hardware.
ORCA has deployed its PT-2 system at the UK National Quantum Computing Centre and demonstrated practical applications, including optimizing fiber network routes for Vodafone, where the quantum solution reportedly completed in minutes what classical algorithms would take much longer to process. The company is preparing to launch its PT-3 commercial system in 2026, which the company claims will match the computational output of approximately 180 GPUs for certain tasks.
QuiX Quantum (Netherlands)
QuiX Quantum, established in 2019 in Enschede, develops programmable photonic quantum processors built on silicon nitride photonic integrated circuits. The company has raised approximately $42 million, including a Series A round in 2025, and leverages the Netherlands’ strong photonics manufacturing heritage.
QuiX processors are used by research institutions and companies exploring quantum simulation, optimization, and quantum machine learning. The company announced its plan to introduce a first-generation universal single-photon quantum computing system in 2026, expanding its platform beyond its earlier focus on boson sampling.
Quantum Computing Inc. / QCi (United States)
Quantum Computing Inc. (Nasdaq: QUBT), based in Hoboken, New Jersey, has positioned itself as a vertically integrated photonics and quantum optics company. QCi operates Fab 1, a thin-film lithium niobate (TFLN) photonic chip manufacturing facility in Tempe, Arizona.
In late 2025, QCi unveiled Neurawave, a photonics-based reservoir computer designed for integration with existing classical computing infrastructure. The company demonstrated quantum-secured communications with Ciena at OFC 2026 and acquired Luminar Semiconductor for $110 million in early 2026 to expand its photonic component portfolio.
Quantum Source (Israel)
Quantum Source, founded in 2021 in Rehovot, Israel, has raised $77 million including a $50 million Series A. The company is developing a photonic platform for fault-tolerant quantum computing based on its proprietary ORIGIN engine, which uses semiconductor quantum dots to generate entangled photon clusters, a key resource for measurement-based quantum computation.
Quantum Source’s approach aims to combine the scalability advantages of photonics with deterministic entanglement generation, addressing one of the main bottlenecks in linear optical quantum computing.
QBoson (China)
QBoson (also known as Bose Quantum Technology), based in Beijing, is a leading Chinese quantum computing company focused on photonic approaches. The company has raised over 100 million dollars across multiple rounds and develops coherent photonic quantum computers, having unveiled systems with up to 1,000 computational qubits.
QBoson launched the Wuyue Photonic Quantum Computing Cloud Platform and the Kaiwu SDK development kit for its systems. In August 2025, QBoson hit a milestone by launching China’s first photonic quantum computer factory in Shenzhen, aiming to mass-produce room-temperature photonic quantum computers.
TuringQ (China)
TuringQ, founded in 2021 in Shanghai, develops integrated photonic quantum chips fabricated using CMOS-compatible silicon photonics processes. The company has raised over $128 million (more than 1 billion yuan), with significant new funding in early 2026.
TuringQ and the Wuxi Photonic Chip Institute (CHIPX) won a top award at the World Internet Conference for their large-scale programmable photonic quantum processor, which features a pilot production line capable of 12,000 six-inch wafers annually. TuringQ has also introduced quantum-inspired solutions for practical applications like autonomous valet parking, demonstrating the technology’s near-term commercial potential.
QC82 (United States)
QC82, founded in 2022 as a spinout from the University of Virginia, is an early-stage company developing integrated photonic chips for fault-tolerant quantum computing at room temperature. In July 2025, QC82 published its proprietary architecture for scalable, mass-reproducible fault-tolerant photonic quantum computing, providing a long-term roadmap for industrial-scale systems. The company focuses on continuous-variable quantum computing and on-chip photon number-resolving detectors for achieving fault tolerance.
Rotonium (Italy)
Rotonium, co-founded by Roberto Siagri and Fabrizio Tamburini, is developing photonic quantum processors designed for edge computing applications. The company takes a distinctive approach by encoding quantum information using the orbital angular momentum (OAM) of photons, creating single-photon qubits (higher-dimensional quantum units) that may offer advantages in scalability and robustness. Rotonium’s systems are designed for size, weight, and power (SWaP) optimization, targeting use cases where quantum processing needs to happen outside traditional data center environments.
Photonics Components: Enabling Quantum Across Modalities
Beyond the companies building full-stack photonic quantum computers, photonic components play a critical enabling role across virtually all quantum computing modalities. Superconducting, trapped ion, and neutral atom systems all rely on photonic technologies for tasks like qubit control, readout, and interconnection. Photonic components are also essential for quantum networking, quantum key distribution, and quantum sensing applications.
Several companies specialize in providing these critical photonic building blocks:
- Hamamatsu Photonics (Japan) manufactures high-sensitivity single-photon detectors and optical components used across quantum research.
- Sparrow Quantum (Denmark), a spinout from the Niels Bohr Institute, produces deterministic single-photon sources based on quantum dots and raised €27.5 million Series A in late 2025.
- Ligentec (Switzerland) fabricates low-loss silicon nitride photonic integrated circuits used in quantum and classical applications.
- Monarch Quantum (US), which launched in January 2026, builds integrated photonics systems called Quantum Light Engines that package lasers, modulators, and control electronics into factory-aligned modules for quantum hardware; the company was recently selected by NASA JPL for a space-based quantum gravity gradiometer mission.
- Vescent Photonics (US) supplies precision laser systems, frequency combs, and servo controllers widely used in atomic physics and quantum experiments.
- IPronics (Spain) develops programmable photonic processors.
- QphoX (Netherlands) is building quantum transducers to connect superconducting qubits via optical links.
- Vexlum (Finland) produces VECSEL laser sources used in quantum systems. These component suppliers form the essential supply chain that photonic quantum computing depends on.
Company Summary Table
|
Company |
Country |
Photonic Approach |
Founded |
Notable Development |
|
PsiQuantum |
United States |
Silicon photonics, fault-tolerant |
2016 |
GlobalFoundries partnership; Brisbane and Chicago deployment sites |
|
Xanadu |
Canada |
Squeezed light, CV encoding |
2017 |
GKP state error correction; PennyLane framework |
|
Quandela |
France |
Single-photon sources, quantum dots |
2017 |
CEA system delivery; MosaiQ cloud platform |
|
ORCA Computing |
United Kingdom |
Time-domain multiplexing |
2019 |
PT-2 at UK NQCC; PT-3 launching 2026 |
|
QuiX Quantum |
Netherlands |
Silicon nitride PICs |
2019 |
Universal single-photon system planned 2026 |
|
QCi |
United States |
TFLN photonic chips |
2018 |
Fab 1 in Tempe, AZ; Neurawave reservoir computer |
|
Quantum Source |
Israel |
Entangled photon clusters |
2021 |
ORIGIN engine for measurement-based QC |
|
QBoson |
China |
Coherent photonic QC |
2020 |
Shenzhen factory; 1,000-qubit system unveiled |
|
TuringQ |
China |
CMOS-compatible photonic chips |
2021 |
World Internet Conference award; pilot wafer line |
|
QC82 |
United States |
CV fault-tolerant PICs |
2022 |
Published scalable FT architecture (2025) |
|
Rotonium |
Italy |
OAM-encoded qudits |
~2022 |
Edge-optimized SWaP photonic processors |
Looking Ahead
Photonic quantum computing has attracted substantial investment and attention over the past several years. The ability to operate at room temperature, leverage existing semiconductor manufacturing processes, and integrate with fiber optic networks makes photonics a compelling platform for scaling quantum computers. Several companies in this space are working toward key technical milestones around error correction and fault tolerance, though significant engineering challenges remain, particularly in deterministic photon generation, photon loss management, and efficient multi-photon entanglement.
The geographic diversity of the field is notable – serious photonic quantum computing efforts are underway in North America, Europe, Asia, and the Middle East. Government funding from the United States, United Kingdom, France, China, and the EU continues to support photonic quantum research through national quantum strategies. Meanwhile, private investors have committed billions to photonic quantum companies, reflecting confidence in the platform’s long-term potential. The next few years will be critical for demonstrating whether photonic systems can deliver on their theoretical advantages at practical scale.
Frequently Asked Questions
What is the main advantage of photonic quantum computing?
Photonic quantum computers can operate at room temperature, unlike superconducting systems that require cooling to near absolute zero. They also integrate naturally with existing fiber optic infrastructure, which could be advantageous for quantum networking and distributed computing applications.
How do photonic quantum computers encode information?
Different companies use different encoding schemes. Some encode information in the properties of individual photons (discrete-variable), others use the continuous properties of light fields like squeezed states (continuous-variable), and some use higher-dimensional encodings like orbital angular momentum. Each approach has different tradeoffs in terms of scalability, error rates, and hardware requirements.
Are photonic quantum computers commercially available?
Several companies offer cloud access to photonic quantum processors, and some have delivered physical systems to national computing centers and research institutions. However, large-scale fault-tolerant photonic quantum computers capable of solving commercially relevant problems beyond classical reach are still in development.
How does photonic quantum computing compare to superconducting approaches?
Superconducting quantum computers (developed by IBM, Google, and others) currently have more mature error correction demonstrations, but require expensive cryogenic cooling. Photonic systems offer room-temperature operation and manufacturing compatibility with semiconductor fabs, but face challenges around photon loss and deterministic entanglement. Both approaches are actively being pursued, and it remains an open question which platform will prove most practical at scale.
What role do photonic components play in non-photonic quantum computers?
Photonic technologies are essential across virtually all quantum computing modalities. Superconducting, trapped ion, and neutral atom systems all use lasers, optical fibers, single-photon detectors, and other photonic components for qubit control, measurement, and interconnection. Companies like Hamamatsu, Sparrow Quantum, and QphoX supply these components to the broader quantum industry.
