Xanadu and Quandela: Two More Roads to Photonic Quantum
Photonics is not one idea
When people say "photonic quantum computer" they can mean quite different designs. PsiQuantum (profiled here) is one. Xanadu and Quandela are two others, and the contrast shows how wide the field still is. For the basics, start with photonic quantum computing explained.
Xanadu: error resistant light on a chip
Xanadu is a Canadian company. Its best known recent result, reported as published in Nature on June 4, 2025, is the on chip generation of Gottesman, Kitaev and Preskill states, usually shortened to GKP states. These are a special way of encoding a qubit in light that has built in resistance to some kinds of error. Coverage describes it as the first time such states were generated on an integrated chip platform.
- Manufacturing angle: The chips use ultra low loss silicon nitride waveguides made on 300 millimeter wafers, the same wafer size used in modern chip factories.
- The honest catch: Xanadu itself frames reducing optical loss as the next big step. Loss is the number that decides whether photonic error correction works at scale.
- Aurora: Earlier, Xanadu presented a system called Aurora, described by BetaKit as four interconnected server racks holding 12 qubits, with a stated long term target of around one million physical qubits.
One third party analysis summarised Xanadu's three Nature papers by saying the technology works but is not yet fault tolerant. That sounds right to us: real progress, real distance still to go.
Xanadu in the markets
Xanadu's SEC filing (a Form 20-F) says it completed its business combination with Crane Harbor Acquisition Corp, and press coverage reports that shares began trading on Nasdaq and the TSX under the ticker XNDU in late March 2026. Deal terms and valuations vary between outlets, so check the filings if the details matter to you. Public listings bring new transparency, but also new pressure. Nothing here is financial advice.
Quandela: sources of single photons and a cloud machine
Quandela is a French company that builds quantum computers and photon sources. According to an OVHcloud press release dated April 17, 2026, its photonic computer Belenos has 12 qubits and became available on the OVHcloud Quantum Platform, billed per second with no commitment. Emulators on that platform reportedly start at 0.03 euros per hour. The announcement was made at the Quantum Defence Summit.
Quandela's public roadmap for 2026 to 2033 says it is assembling a first system built around spin photon sources and plans demonstrations of logical qubits. We found no independent confirmation that those milestones had been reached, so treat them as plans.
What the difference teaches
| Company | Reported focus | Reported milestone |
|---|---|---|
| Xanadu | Error resistant GKP qubits, modular racks | GKP states on chip, Nature, June 2025 |
| Quandela | Single photon sources, cloud access | 12 qubit Belenos on OVHcloud, April 2026 |
| PsiQuantum | Foundry built chipset at huge scale | Omega chipset announced Feb 2025 |
Why the cloud step matters
A machine you can rent by the second is a machine real developers can poke at. That feedback loop is how programming tools and algorithms mature. Our guide on trying a quantum computer online shows how to start yourself.
Why be optimistic
Three different photonic teams, three different designs, all leaning on the chip industry. If one design hits its loss target, the others learn from it. Competition inside a platform is a healthy sign. Compare with other platforms in the types guide.
Sources and further reading
- Converge Digest: Xanadu error resistant photonic qubits on chip
- BetaKit: Xanadu advancement toward scalable quantum computing
- SEC: Xanadu Form 20-F (business combination with Crane Harbor)
- Photon Capital: the 1% loss wall (third party analysis)
- OVHcloud: Quandela Belenos on the OVHcloud Quantum Platform
- Quandela roadmap (March 2026)
Reported as of 2026-10-09. Company roadmaps are targets and often slip. Check each company's own announcements. This page is education, not financial advice, and the QNT memecoin is independent of every company named here.
Frequently asked questions
What is a GKP state?
A way of encoding a qubit in light that resists some errors. Xanadu reported making them on a chip in 2025.
Can I use a photonic quantum computer?
Quandela's 12 qubit Belenos was reported available on the OVHcloud platform in April 2026, billed per second.
Is photonic quantum fault tolerant yet?
No. Optical loss is the main remaining hurdle.
Is this investment advice?
No. Nothing here recommends any company or token.
Keep reading
- PsiQuantum: The Big Photonic Bet, Explained
What PsiQuantum is building, why it chose light and chip factories, and what is reported about its Brisbane and Chicago sites, in plain English. - Photonic Quantum Computing Explained
How does photonic quantum computing work? See how single particles of light become qubits, why photon loss is the main hurdle, and where the approach stands. - Types of Quantum Computers: Superconducting, Ion, Photonic and More
A guide to the main ways quantum computers are built, with the strengths and trade-offs of each approach. - Why Manufacturability Could Decide the Quantum Race
Why building quantum chips in real factories matters as much as clever physics, with examples from photonic, silicon and other platforms.
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