Quantum Company Directory

Trapped-ion quantum computing company formed from Honeywell Quantum Solutions and Cambridge Quantum; reported ~$1.1B in private funding before a reported 2026 US IPO (~$1.68B raised).

Building fault-tolerant photonic quantum computers with utility-scale sites announced in Brisbane (Australia) and Chicago (US).

Publicly traded trapped-ion quantum computing company; reported a ~$1B equity offering in 2025 and acquired Oxford Ionics.

Quantum and AI software company spun out of Alphabet; reported raising ~$500M (2022) and ~$450M (2025).

Pioneering quantum annealing company, public since 2022 and the first commercial supplier of quantum computers; now also developing gate-model systems.

Spanish quantum software company (CompactifAI model compression, Singularity stack); Europe's most-funded quantum software firm, reported as a unicorn by regional databases.

European superconducting quantum computing leader selling on-premises systems and cloud access; reported a ~$320M Series B in September 2025 and regional databases place cumulative funding (incl. grants) near $700M.

Full-stack superconducting quantum computing company, public since 2022; raised several hundred million dollars via ATM programs in 2025.

Neutral-atom quantum computing company spun out of CNRS; reported a €100M Series B in 2023 and major public contracts; regional databases place cumulative funding (incl. grants) near $590M.

China's first quantum computing company (spun out of USTC), building superconducting 'Wukong' series chips, full-stack software (QRunes) and quantum cloud.

Developing optically-linked silicon spin qubits with a long-running partnership with Microsoft.

State-backed quantum communications operator established by China Telecom with RMB 3B registered capital, building quantum-secure networks and services.

Shenzhen company selling desktop NMR quantum computers for education and cloud-accessible superconducting machines; media reported a ~¥300M Series B in 2024.

UK startup developing silicon-based quantum chips compatible with standard CMOS foundry processes; reported cumulative funding around $230M following later-stage raises.

Dutch superconducting qubit processor foundry scaling chips via its proprietary VIO (Vertical I/O) architecture; reported ~$200M raised.

Neutral-atom quantum computing company spun out of Harvard/MIT; reported a $230M Series B in early 2025 with participation from Google.

Neutral-atom quantum computing company known for demonstrating 1,000+ qubit arrays; partnered with Microsoft on cloud access.

UK superconducting quantum computing company offering quantum computing as a service through major cloud platforms; funding trackers reported cumulative raises around $350M following its 2025–2026 rounds.

Grenoble-based startup leveraging semiconductor FD-SOI manufacturing to scale silicon spin qubits; reported cumulative funding around $165M after its 2026 round.

Leading provider of quantum control and orchestration hardware/software used by labs and QPU makers worldwide; reported a ~$170M Series C cited by industry analysts.

Neutral-atom quantum technology company (formerly ColdQuanta) spanning computing and quantum sensing; announced a SPAC merger valuing it around $1.8B.

Pioneer of superconducting 'cat qubits' that suppress bit flips; reported a €100M Series B in January 2025, with cumulative funding around $160M.

First Chinese quantum technology company listed on the STAR Market (2020); supplies QKD equipment for the national quantum backbone network.

Photonics-based fault-tolerant quantum computing startup founded by quantum optics veterans.

Quantum control and error-suppression software company with products for enterprises and infrastructure providers.

Quantum software company whose synthesis engine compiles high-level functional models into optimized quantum circuits.

Hefei-based quantum precision measurement company (electron paramagnetic resonance, diamond quantum sensors) expanding into quantum computing control.

UNSW spin-out fabricating atomically precise silicon quantum processors based on Michelle Simmons' research program.

Builds the quantum error correction stack (DD1 decoders, Deltaflow) used across leading qubit platforms.

German startup building photonic quantum processing units for industrial analog computing; reported a €68M round in 2024.

Builds quantum networking units and single-photon detection technology for datacenter-scale quantum networks.

Shanghai photonic quantum computing and photonic chip company led by JIN Xianmin's team at Shanghai Jiao Tong University.

Publicly traded company marketing photonic and nonlinear-quantum-optics machines for optimization and sensing applications.

Photonic quantum computing company built around deterministic semiconductor quantum-dot photon sources.

Trapped-ion quantum computing company using its MAGIC radio-frequency control scheme; reported a €52.5M Series B in 2023.

Neutral-atom quantum computing startup from the Garching quantum valley ecosystem; reported ~€50M in combined 2024 financing.

Photonic quantum systems company integrating fiber-loop quantum memory with off-the-shelf photonics.

Canadian startup using bosonic modes for error-corrected superconducting qubits; reported a ~$44M raise in 2024.

Applied quantum algorithms company founded by UCL/Bristol academics; focuses on near-term useful quantum simulation.

Quantum-safe encryption company providing cloud- and hardware-based quantum entropy for key generation.

Trapped-ion quantum computing startup co-founded by DUAN Luming (Tsinghua University); media-reported A-round financing.

Photonic quantum processor company; reported multi-million-euro raises including a 2024 Series A extension.

Supplier of modular, scalable quantum control stacks (Control Hub, cluster hardware) to labs worldwide.

Quantum communication company developing QKD terminals and distributed ion-trap quantum computing prototypes.

Pioneer in quantum-safe encryption and photon counting instruments; majority owned by SK Telecom (South Korea) since 2018.

Quantum software development platform (Triple Alpha compiler stack); announced a SPAC merger to list in the US.

Innsbruck-based architect of the parity quantum computing model with an associated operating system stack.

Application- and hardware-aware quantum algorithm company focused on compressed circuits for today's devices.

Trapped-ion quantum computer manufacturer serving European research and industry customers.

Silicon spin qubit company using standard CMOS manufacturing, spun out of UNSW Sydney.

Diamond NV-center quantum accelerator company developing room-temperature deployable systems.

Uses carbon nanotubes as qubits connected via microwave quantum bus for scalable on-chip networks.

Beijing startup building coherent Ising machines for combinatorial optimization ('.lbq' optical computing).

Early Chinese quantum communication company founded with USTC ties, supplying QKD systems and quantum random number generators.

Startup pursuing electrons-over-helium qubits; announced plans for a fabrication facility in Illinois.

National University of Singapore spin-out developing satellite-based quantum key distribution for global secure links.

University of Bristol spin-out miniaturizing QKD transmitters and receivers on photonic integrated circuits.

Swiss deep-tech startup commercializing diamond NV-center quantum microscopes for materials analysis.

Tokyo-based quantum computing software company focused on quantum chemistry algorithms and QURI platform.

Delft-based supplier of superconducting nanowire single-photon detectors used in quantum optics and QKD labs worldwide.

Builds cold-atom interferometer sensors ('Gravio') for underground resource mapping and navigation.

India's leading quantum-safe cryptography startup offering QKD (Armos) and quantum random number generators (Tropos).