Pomegra
French quantum startup ColibriTD secured €4M from Earlybird to bring its hybrid PDE solver to aerospace, nuclear, and semiconductor clients.
- Earlybird Venture Capital led the €4M round, joined by SymbiaVC and Medin VC; post-money valuation was not disclosed.
- H-DES, ColibriTD's core product, uses variational quantum circuits to solve partial differential equations that strain classical HPC clusters.
- Seven co-construction projects completed across six sectors, with named partners including Thales, the European Space Agency, and BMW.
Paris Startup Closes €4M on August 27, 2026
ColibriTD, a Paris-based quantum software company founded in 2019 by Laurent Guiraud and Hacène Goudjil, closed a €4 million seed round on August 27, 2026. Earlybird Venture Capital led the raise - the same firm that wrote the company's €1 million pre-seed check in 2023 - with co-investment from SymbiaVC and Medin VC. Valuation was not disclosed.
The capital follows a period of active validation across industrial clients and positions the company to convert co-construction partnerships into repeatable revenue.
What Problem Does Quantum Simulation Actually Solve?
Partial differential equations are the mathematical backbone of every serious multiphysics model: fluid flow, thermal stress, electromagnetic coupling, structural deformation. Classical numerical solvers have served aerospace and nuclear engineering for decades, but their computational cost scales badly as design complexity grows. Denser chips need finer simulations of heat distribution and electron behavior. Next-generation reactor designs involve coupled physics that exhaust the memory of even large HPC clusters.
ColibriTD's H-DES (Hybrid Differential Equation Solver) does not attempt to replace classical solvers outright. The algorithm encodes candidate solutions to PDEs into parameterized quantum circuits, then optimizes those circuits using classical hardware. The hybrid loop allows the solver to run on today's noisy, mid-scale quantum processors rather than waiting for fault-tolerant machines that remain years from commercial availability. H-DES is already integrated into IBM's Qiskit Functions Catalog under the label QUICK-PDE, reducing the friction for enterprise teams already working in that ecosystem.
Is There Proof of Industrial Demand at This Stage?
Seven co-construction projects across six sectors is a meaningful number for a pre-Series A quantum software company. Named engagements include Thales on radio-frequency and combustion modeling, the European Space Agency on space and climate simulation workloads, and BMW on automotive engineering applications. The company also lists semiconductor design, nuclear energy, and quantitative finance among its active verticals.
Co-construction contracts differ from conventional pilots. Customers commit engineering time alongside budget, defining the problem jointly and validating outputs against internal standards. That level of commitment suggests the technology has cleared at least a minimum accuracy threshold in industrial settings, even if production deployment remains a separate question.
Earlybird's Follow-On as Market Signal
Earlybird's decision to lead the seed after originating the pre-seed is worth examining. The Berlin-based firm has backed European deeptech across multiple hardware and software cycles and is accustomed to the longer commercialization timelines that enterprise quantum software demands. Sales cycles in aerospace and nuclear procurement run in years, not quarters. A lead investor willing to maintain position through that timeline reduces the financing risk ColibriTD would otherwise face before hitting the revenue milestones a Series A typically requires.
The round's co-investors, SymbiaVC and Medin VC, add European deeptech coverage without changing the fundamental narrative: this is a technology-first bet on a specific category of quantum software that has demonstrated feasibility but not yet proven unit economics at scale.
Use of Funds
The €4 million will go toward three areas: expanding the R&D team with quantum algorithm researchers and domain-specialist engineers, deepening partnerships with quantum hardware vendors and academic institutions, and beginning international commercial development. Specific headcount targets and geographic expansion plans were not disclosed.
Competitive Position
ColibriTD operates in a narrow but growing field. Several European and North American startups are building quantum-enhanced PDE solvers, many emerging from university spinouts in Germany, the UK, and the United States. ColibriTD's near-term differentiation rests on its vertical focus in regulated, high-consequence industries, the existing IBM Qiskit integration, and the named enterprise co-construction partnerships achieved before raising a formal seed. Each of those is a real but fragile advantage - competitors are working on comparable integrations, and enterprise relationships at pilot scale do not guarantee commercial contracts.
The structural risk common to all near-term quantum software: if fault-tolerant hardware arrives faster than expected, current hybrid architectures may need significant reworking. If it arrives slower, market adoption for the current generation may grow more slowly than investor timelines require.
Outlook
ColibriTD enters late 2026 with fresh capital to scale its team and deepen industrial partnerships. The company's path to a Series A depends on converting co-construction engagements into production contracts - preferably in at least two of its target verticals before the next fundraise. Earlybird's continued lead position reduces near-term financing risk. The harder work is demonstrating that H-DES delivers economically meaningful performance gains at the noise levels of current quantum hardware, where the gap between benchmark results and production-grade reliability remains a recurring challenge across the category.
