Quandela is France’s photonic quantum computing champion and one of only a handful of companies globally producing commercial quantum computers based on single photons. Founded in 2017 as a spinout from the Centre for Nanosciences and Nanotechnology (C2N) at the CNRS-University Paris-Saclay, the company has developed proprietary single-photon sources of exceptional brightness and indistinguishability, built photonic quantum processors available via cloud access, and created Perceval — an open-source photonic quantum computing software framework with growing adoption. France 2030’s quantum strategy supports Quandela as the photonic computing node of France’s diversified quantum portfolio.
Scientific Foundations
Quandela’s technology rests on decades of fundamental research at CNRS on quantum optics and photon-matter interaction. The C2N laboratory — where Quandela’s founding team conducted their research — has been a world leader in semiconductor quantum dot engineering since the 2000s. The critical enabling technology: semiconductor quantum dots that emit single photons on demand with near-perfect indistinguishability (identical quantum properties for each emitted photon) and high brightness (emitting efficiently into a controlled optical mode).
These properties are essential for photonic quantum computing. Quantum interference — the mechanism underlying photonic gate operations — requires photons to be indistinguishable. Early quantum dot sources produced photons with too much variation for useful quantum interference; by 2017, the C2N group had developed quantum dot sources with over 99% indistinguishability, crossing the threshold needed for commercial photonic quantum computing.
Valérian Giesz, Quandela’s CEO, completed his PhD at C2N on near-optimal single-photon sources from quantum dots — the thesis work that directly enabled Quandela’s hardware. Co-founders Niccolo Somaschi (CTO) and Pascale Senellart (Chief Scientific Officer, also an academic at C2N) rounded out a founding team combining world-class physics expertise with commercial ambition.
Technology: Why Photons
Photonic quantum computing has fundamental advantages that distinguish it from superconducting and neutral atom approaches:
Room temperature operation: Photons do not interact strongly with thermal noise, so photonic quantum processors can operate at room temperature rather than requiring millikelvin dilution refrigerators. This dramatically reduces system cost, size, and operational complexity.
Natural communications compatibility: Photons are the natural carrier of quantum information over fiber optic networks. A photonic quantum computer interfaces naturally with quantum communication infrastructure — important for quantum networking and quantum cryptography applications.
No decoherence during transmission: Photons in optical fiber maintain coherence over long distances, enabling distributed quantum computing architectures impossible with matter-based qubits.
The fundamental challenge of photonic quantum computing is probabilistic gates. Unlike superconducting or neutral atom gates (which are deterministic), linear optical two-qubit gates succeed only probabilistically — typically 25% probability per attempt. Making circuits of practical depth requires either enormous overhead in photon sources and detectors, or measurement-based quantum computing approaches that shift the computational model significantly. Quandela addresses this challenge through both better photon sources (reducing overhead) and improved circuit architectures.
Products and Platform
Quandela Cloud: Cloud-accessible photonic quantum processors available for research and early commercial applications. The platform gives researchers access to Quandela’s hardware without requiring on-site deployment, enabling quantum algorithm development and benchmarking.
Perceval: Quandela’s open-source photonic quantum computing framework, available on GitHub and installable via pip. Perceval provides simulation, optimization, and programming tools for photonic circuits, supporting both Quandela’s hardware and general photonic circuit design. The framework has been adopted by photonic quantum computing researchers globally and is integrated into multiple university quantum computing courses. Open-sourcing Perceval is a deliberate ecosystem-building strategy: developer adoption of Perceval creates a community invested in Quandela’s hardware platform.
On-Premise Systems: Quandela is developing on-premise photonic quantum systems for customers requiring data sovereignty or low-latency access — relevant for French defense and critical infrastructure customers under France 2030’s sovereignty framework.
Funding
Quandela raised approximately €15 million in total funding through 2024, the most recent round being a €15 million Series A in 2022 led by Quantonation (France’s dedicated quantum VC fund) with participation from Bpifrance and others. This is the smallest capitalization among France’s major quantum hardware startups, reflecting both Quandela’s earlier commercial stage and the capital efficiency advantages of photonic hardware (no dilution refrigerators means lower equipment costs than superconducting approaches).
France 2030 PEPR Quantique grants supplement equity funding, providing research capital for hardware development milestones that justify additional equity rounds.
Competitive Landscape
Photonic quantum computing globally is dominated by two approaches: linear optical quantum computing (Quandela, PsiQuantum) and continuous variable quantum computing (Xanadu, Canada). The competitive picture:
PsiQuantum (UK/US, $665 million raised): Targets large-scale fault-tolerant photonic quantum computing, partnering with GlobalFoundries for chip manufacturing. PsiQuantum’s approach is silicon photonics rather than quantum dot sources, accepting lower single-photon quality in exchange for manufacturing scalability. The company has announced a partnership with Australia for a national quantum computer.
Xanadu (Canada, $300 million raised): Continuous variable quantum computing using squeezed light, with cloud access through the PennyLane platform. Xanadu’s approach is complementary to Quandela’s gate-based photonic approach.
Quandela’s differentiation: The highest-quality single-photon sources commercially available, derived from C2N research, give Quandela’s processors higher fidelity at small-to-medium scale than silicon photonic approaches. For near-term NISQ (Noisy Intermediate-Scale Quantum) applications, source quality matters more than manufacturing volume.
Strategic Role in France’s Quantum Ecosystem
Within France’s quantum portfolio, Quandela occupies the photonics niche — the approach most naturally suited for quantum networking applications and room-temperature deployment. France 2030’s quantum strategy explicitly funds multiple hardware approaches simultaneously, recognizing that the winning architecture is not yet determined.
Quandela’s connections to the broader France 2030 ecosystem are multiple: CEA-Grenoble for advanced photonic chip fabrication, INRIA for quantum algorithm development on photonic platforms, and the quantum communications infrastructure being developed under the French national quantum network program (which will require photonic quantum interfaces for long-distance quantum key distribution).
The company’s room-temperature operation and natural fiber-optic compatibility give it specific relevance for France 2030’s digital sovereignty objectives: photonic quantum processors can be deployed in standard data center environments by OVHcloud and Scaleway without the specialized cryogenic infrastructure that superconducting systems require — potentially enabling quantum-enhanced cloud services on French sovereign infrastructure within the current decade.