Quantum

Alice & Bob is a Paris-based quantum computing startup that develops a novel qubit technology called cat qubits — quantum bits that exploit a quantum mechanical phenomenon to inherently suppress certa

Atom Computing is a Berkeley-based quantum computing company that develops quantum computers using optically trapped neutral atoms — a different physical approach from superconducting qubits (IBM, Goo

Classiq Technologies builds the software layer that makes quantum computing accessible to developers without deep physics expertise. Its platform provides a high-level quantum programming environment

Infleqtion (formerly ColdQuanta) is a Boulder, Colorado-based quantum technology company that develops quantum computing hardware, quantum sensing systems, and quantum networking components using ultr

IonQ is a College Park, Maryland-based quantum computing company that develops and operates trapped-ion quantum computers accessible via cloud API through Amazon Web Services, Microsoft Azure, and Goo

Kyoto Fusioneering is a Japanese fusion energy engineering company focused on developing and commercializing the reactor components and subsystems required to build practical fusion power plants. Foun

Marvel Fusion is a Munich-based nuclear fusion startup founded in 2019 by Moritz von der Linden, Stephanie Lüdecke, and Ingo Reuter. The company is developing a laser-driven inertial confinement fusio

Menlo Microsystems (branded as Menlo Micro) is an Irvine, California-based semiconductor company that has developed a new category of electronic switch called the Ideal Switch, built on Micro-Electro-

Multiverse Computing is a San Sebastian, Spain-based quantum software company that develops algorithms for solving complex optimization and machine learning problems in finance, energy, and manufactur

Oxford Quantum Circuits (OQC) is an Oxford-based quantum computing company that develops superconducting quantum processors using a proprietary qubit architecture called Coaxmon, which stores quantum

Pacific Fusion is an American fusion energy company developing a magnetized target fusion (MTF) approach to generating clean, affordable power. Unlike the large-scale, high-field magnetic confinement

Pasqal is a quantum computing company founded in 2019 by Georges-Olivier Reymond and Christophe Jurczak, along with a scientific team led by Professor Antoine Browaeys and Dr. Thierry Lahaye from Inst

Photonic Inc. is a quantum computing company developing silicon spin qubits with integrated silicon-photonic interconnects for quantum networking — the only quantum startup with Microsoft as both a co

PsiQuantum is a Palo Alto, California-based photonic quantum computing company — backed with $700+ million in total funding including a $1 billion Series E in February 2025 led by BlackRock, Temasek,

Q-CTRL is a Sydney-based quantum technology company that provides quantum control infrastructure software — firmware and middleware that sits between quantum hardware and application software to activ

Qrypt is a cybersecurity company founded in 2019 by Kevin Chalker, headquartered in New York City. The company specializes in quantum-safe cryptography — security protocols designed to withstand attac

Quandela is a French quantum computing company founded in 2017 as a spinout from the Centre for Nanoscience and Nanotechnology (C2N) at Paris-Saclay University, headquartered in Massy, France (near Pa

Quantinuum is a Cambridge, UK and Broomfield, Colorado-based integrated quantum computing company — majority owned by Honeywell (NASDAQ: HON) with $625+ million in total funding including a $300 milli

Quantum Brilliance is a quantum computing company founded in 2019 as a spinout from the Australian National University (ANU) in Canberra, Australia, with additional operations in Stuttgart, Germany. T

Quantum Machines is a quantum computing infrastructure company founded in 2018 by Dr. Itamar Sivan, Dr. Yonatan Cohen, and Nissim Ofek and headquartered in Tel Aviv, Israel, with offices in the United

Quantum Space is a commercial space infrastructure company founded in 2021 and headquartered in Rockville, Maryland. The company develops versatile multi-mission spacecraft — its Ranger and Scout plat

QuEra Computing develops neutral atom quantum computers, a technology approach that uses arrays of individual rubidium atoms held in place by laser tweezers as qubits. Unlike superconducting qubits (I

Rigetti Computing is a Berkeley-based quantum computing company that builds superconducting quantum processors and develops the full software stack for programming, simulating, and running quantum alg

Strangeworks is an Austin-based quantum computing platform company that provides enterprise customers with a unified development environment for accessing and comparing quantum hardware from multiple

Tokamak Energy is a UK-based private fusion energy company developing compact spherical tokamak reactors and high-temperature superconducting (HTS) magnet technology as a faster, lower-cost path to co

Xairos Systems Inc. is a Boulder, Colorado-based deep technology company developing quantum-based time synchronization and positioning, navigation, and timing (PNT) technology as a GPS-independent alt

Xanadu is a Toronto-based quantum computing company founded in 2016 by Christian Weedbrook, focused on photonic quantum computing — a hardware approach that uses particles of light (photons) rather th