Q2B25 Paris | Thomas Volz, Managing Director & CTO, Quandela

Q2B25 Paris | Thomas Volz, Managing Director & CTO, Quandela

by Thomas Volz

Applied Sciences & Engineering Computing & Cybersecurity UYComputer scienceUYXNatural computing
🎙 Thomas Volz 👥 6K 📅 October 17, 2025 ⏱ 20 min 👁 162 📄 expert opinion 🧭 2026-08-16
Available in: English (current) Français

Keywords

photonic quantum computingfault tolerancequantum dotboson samplingquantum error correction

Summary

Thomas Volz, CTO of Quandela, presents the company’s roadmap towards fault-tolerant quantum computing using photonic technology. He begins by introducing Quandela’s background: founded in 2017, based on 35 years of CNRS research, with over 120 employees and facilities in France, Canada, South Korea, and Germany. The core technology is a single-photon source based on a quantum dot in a micropillar cavity, which emits single photons on demand. These photons are multiplexed and sent through a universal interferometric chip, where they interfere and are detected, enabling boson sampling. The current system, with 12 qubits, is being delivered to a EuroHPC site. Applications include hybrid quantum AI, such as a quantum GAN for generating nighttime images for autonomous vehicles, and financial classification tasks. The roadmap includes scaling up the boson sampler to around 40 photons, beyond which classical simulation becomes intractable. For fault tolerance, Quandela proposes a spin-optical quantum computing (SPOCK) architecture, which uses entangled quantum dot sources and small entangling chips, significantly reducing resource overhead compared to fusion-based approaches. The architecture is modular, low-loss, and energy-efficient. The talk concludes with plans to industrialize the production of semiconductor wafers in Munich, including an MBE machine, to ensure a reliable supply chain.

199 words

Critical Evaluation

Value of the Information & Strength of the Argument

The talk provides valuable insights into the practical engineering challenges of photonic quantum computing, particularly the emphasis on photon loss as the primary obstacle and the resource efficiency of their SPOCK architecture. The argumentation is coherent and grounded in the company’s technical achievements, such as the 12-qubit system and the generation of caterpillar states. However, the presentation is largely promotional, and the claimed advantages are not independently verified. The speaker acknowledges the need for further development and industrialization, which tempers over-optimism.

Scientific Rigor, Source Quality, Title Accuracy

The talk is based on the speaker’s expertise and company data, but specific sources are not cited. The only link provided is to the Q2B conference website, which is not a scientific reference. The title accurately reflects the content, and the talk is consistent with known developments in photonic quantum computing. The lack of citations reduces the scientific rigor, but the technical details appear plausible.

161 words

Title / Content Match

The title accurately reflects the content: a presentation by Thomas Volz at Q2B25 Paris about Quandela's photonic quantum computing roadmap.

Quality & Reliability

7/10

The speaker is CTO of Quandela, a leading photonic quantum computing company, and presents technical details of their hardware and roadmap. Claims are plausible and align with known developments in the field, but the talk is promotional and lacks independent verification or detailed citations.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Cited Sources

Concurring Sources

Contribution & Novelties

The talk presents Quandela’s specific approach to fault-tolerant photonic quantum computing, the SPOCK architecture, which claims a 100,000-fold resource reduction compared to fusion-based methods. This is a significant engineering contribution, though not yet peer-reviewed. The emphasis on industrializing the supply chain, including wafer growth, is a practical novelty.

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78 words

Radar Profile

The radar profile shows high scores in information quantity and technical level, but lower in reliability due to lack of citations. The talk is informative and technical, but its promotional nature and absence of independent sources temper its overall reliability.

Reliability 6/10

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