Quantum Computing Companies

ORCA Computing is a U.K.-based quantum computing company (spun out of the University of Oxford in 2019) that builds photonic quantum processors using light (single photons) traveling through optical fiber. Its mission is to make quantum computing a practical reality by delivering near-term quantum accelerators for tasks like machine learning,…

Oxford Ionics is a UK-based quantum computing company specializing in trapped-ion technology, distinguished by its use of microwave-based “electronic” quantum gates instead of the laser-based control typical of most ion-trap systems. Co-founded in 2019 by Dr. Chris Ballance and Dr. Tom Harty - both leading ion-trap researchers - the company…

Oxford Quantum Circuits (OQC) is a UK-based quantum computing company founded in 2017 as a spin-out from the University of Oxford. It has emerged as a leading hardware developer focused on building commercially useful quantum computers for real-world applications. OQC was the first European provider of Quantum-Compute-as-a-Service (QCaaS), delivering enterprise-grade…

Pasqal is a French pioneer in neutral-atom quantum computing, building large, reconfigurable arrays of laser‑trapped Rydberg atoms and delivering them as on‑prem accelerators for HPC centers and industrial labs. Unlike many peers that separate “today’s NISQ” from “tomorrow’s FTQC,” Pasqal’s strategy is explicitly continuous: ship useful analog/digital processors now, and…

Planqc is a Munich-based quantum computing startup (founded in 2022 as a Max-Planck-Institute spin-off) developing a neutral-atom quantum computing platform. The company’s core approach is to store quantum information in individual ultra-cold atoms that are trapped in optical lattices - effectively using nature’s identical atoms as qubits. By leveraging techniques…

PsiQuantum is a Silicon Valley-based startup taking a fundamentally different approach: photonic quantum computing. Their goal from the outset has been to build a large-scale, fault-tolerant quantum computer using photons, and they famously stated they need on the order of 1 million physical qubits (photons) for this and intend to…

Quandela is a French quantum computing company founded in 2017 as a spin-off from the Centre for Nanoscience and Nanotechnology (C2N) in Paris. It has established itself as a pioneer in photonic quantum computing, focusing on single-photon-based qubits and integrated photonic circuits. Quandela’s core modality is optical (photonic) quantum computing,…

Quantinuum, formed by the 2021 merger of Honeywell Quantum Solutions and Cambridge Quantum, is another leader in trapped-ion quantum computing. It combines Honeywell’s hardware prowess with Cambridge’s algorithm/software expertise. Quantinuum’s roadmap is notably direct about pursuing fault tolerance, and they’ve recently accelerated their timeline.

Quantum Art is an Israeli quantum computing startup (spun out of the Weizmann Institute of Science in 2022) focused on developing scalable trapped-ion hardware for quantum computers. The company was born out of decades of ion-trap research at Weizmann and the achievement of Israel’s first full-stack quantum computer by its…

Quantum Brilliance (QB) is an Australian-German quantum computing company (founded in 2019 as a spin-out of Australian National University) developing diamond-based quantum accelerators that operate at room temperature. Their hardware uses nitrogen-vacancy (NV) centers in synthetic diamond as qubits - defects in a diamond lattice where a nitrogen atom sits…

Quantum Circuits, Inc. (QCI) is a Yale University spin-out that has pioneered a novel approach to superconducting quantum computing focused on hardware-efficient error correction. Co-founded in 2017 by leading Yale physicists (including Robert Schoelkopf, Michel Devoret, and Luigi Frunzio), QCI’s mission is to accelerate the path to fault-tolerant quantum computers…

Quantum Computing Inc. (QCI) is a young entrant in the quantum computing race that has charted a strikingly different course from its larger rivals. Rather than building superconducting or ion-trap processors requiring extreme isolation, QCI focuses on photonic quantum machines that operate at room temperature and even embrace environmental noise…

QuEra Computing is a Boston-based quantum computing company pioneering neutral-atom quantum processors. Built on research from Harvard and MIT, QuEra operates the world’s largest publicly accessible quantum computer (the 256-qubit Aquila system on Amazon Braket) and is aggressively pursuing fault-tolerant architectures. In early 2025 QuEra secured a major $230 million financing…

QuiX Quantum is a Dutch quantum technology company specializing in photonic quantum computing hardware. Founded in 2019 as a University of Twente spin-off, QuiX has quickly grown into a European leader in photonic quantum processors and systems. Unlike matter-based qubit platforms that use stationary quantum bits on a cryogenic chip,…

Rigetti Computing is a full-stack quantum hardware company specializing in superconducting qubit processors. Rigetti’s qubits are implemented as Josephson-junction-based circuits (transmons) operated at milli-Kelvin temperatures inside dilution refrigerators. This platform offers extremely fast gate speeds (on the order of tens of nanoseconds) and leverages mature semiconductor-fabrication techniques for scalability. Rigetti’s…