Top Quantum Computing companies
Ranked by total raised · 25 of 46 on the roster · Updated Oct 16, 2026
Together these 25 have raised $13.6B. Quantinuum leads with $2.4B, followed by PsiQuantum ($2.3B) and SandboxAQ ($1.4B).
- #01
QuantinuumQuantinuum builds trapped-ion quantum computers and quantum software platforms for optimization, chemistry simulation, and quantum error correction research across enterprise and government sectors.
Trapped-Ion Qubits · Grant $100M
Trapped-Ion QubitsGrant$100MHQ - #02
PsiQuantumPsiQuantum is building a fault-tolerant photonic quantum computer leveraging existing semiconductor manufacturing infrastructure.
Photonic Qubits · Series E $1BPhotonic QubitsSeries E$1BHQ - #03
SandboxAQSandboxAQ develops enterprise software for quantum and AI-based solutions in cryptography, sensing, and simulation.
Quantum Software & Applications · Venture round $500MQuantum Software & ApplicationsVenture round$500MHQ
- #04
Multiverse ComputingMultiverse Computing develops quantum software and AI compression technology for enterprise applications in portfolio optimization, risk modeling, and edge deployment.
Quantum Software & Applications · Series C $570M
Quantum Software & ApplicationsSeries C$570MHQ - #05New
OratomicOratomic is a quantum computing company founded in 2025 in Pasadena, United States, working in neutral-atom qubits.
Neutral-Atom Qubits · Venture round $775MNeutral-Atom QubitsVenture round$775MHQ - #06
InfleqtionInfleqtion develops neutral-atom quantum computers and quantum-enabled products including atomic clocks and RF sensors.
Neutral-Atom Qubits · IPO $550MNeutral-Atom QubitsIPO$550MHQ - #07
IonQIonQ builds trapped-ion quantum computers with industry-leading gate fidelities and offers cloud access through AWS, Azure, and Google Cloud.
Trapped-Ion Qubits · IPO $650MTrapped-Ion QubitsIPO$650MHQ - #08
Rigetti ComputingRigetti designs and manufactures superconducting quantum processors and operates a full-stack quantum computing platform.
Superconducting Qubits · IPO $458MSuperconducting QubitsIPO$458MHQ - #09
XanaduXanadu builds photonic quantum computers and develops PennyLane, an open-source quantum machine learning framework.
Photonic Qubits · IPO $302M
Photonic QubitsIPO$302MHQ - #10
IQMIQM designs and manufactures superconducting quantum computers for research institutions and data centers.
Superconducting Qubits · Series B $320M
Superconducting QubitsSeries B$320MHQ - #11
PasqalPasqal develops neutral-atom quantum processors using optical tweezers to arrange rubidium atoms. The company serves HPC centers, cloud platforms, and enterprise partners pursuing quantum simulation and optimization.
Neutral-Atom Qubits · IPO $360M
Neutral-Atom QubitsIPO$360MHQ - #12
PhotonicPhotonic builds silicon-spin quantum computers that integrate qubits with photonic interconnects for networking and scalability.
Silicon-Spin Qubits · Series B $200MSilicon-Spin QubitsSeries B$200MHQ - #13
Quantum MachinesQuantum Machines builds control and orchestration systems for quantum computers, enabling real-time classical-quantum processing.
Control Systems · Series C $170M
Control SystemsSeries C$170MHQ - #14
QuEra ComputingQuEra builds neutral-atom quantum computers based on research from Harvard and MIT, focusing on optimization problems.
Neutral-Atom Qubits · Series B $230MNeutral-Atom QubitsSeries B$230MHQ - #15
QuantWareQuantWare manufactures superconducting quantum processors as off-the-shelf components for quantum computing research and development.
Component Suppliers · Series B $178M
Component SuppliersSeries B$178MHQ - #16
Q-CTRLQ-CTRL builds quantum control infrastructure software to reduce errors and improve performance across quantum hardware platforms.
Error Correction & Control · Series B-2 $59M
Error Correction & ControlSeries B-2$59MHQ - #17
Atom ComputingAtom Computing develops neutral-atom quantum computers using optical tweezers to trap and manipulate individual atoms.
Neutral-Atom Qubits · Series C $100MNeutral-Atom QubitsSeries C$100MHQ - #18
ClassiqClassiq provides a software platform for designing, optimizing, and executing quantum algorithms at scale.
Quantum Software & Applications · Strategic up-roundQuantum Software & ApplicationsStrategic up-round—HQ - #19
Oxford Quantum CircuitsOxford Quantum Circuits builds superconducting quantum computers with proprietary Coaxmon technology and offers cloud access.
Superconducting Qubits · Series B $100M
Superconducting QubitsSeries B$100MHQ - #20
Alice & BobAlice & Bob develops cat qubits, a novel superconducting architecture designed to reduce error correction overhead.
Superconducting Qubits · Series B extensionSuperconducting QubitsSeries B extension—HQ - #21
RiverlaneRiverlane develops quantum error correction software and hardware decoders to enable fault-tolerant quantum computing.
Error Correction & Control · Series C $75MError Correction & ControlSeries C$75MHQ - #22
Silicon Quantum ComputingSilicon Quantum Computing develops silicon-based quantum processors using phosphorus donor atoms in silicon.
Silicon-Spin Qubits · Grant $12.3MSilicon-Spin QubitsGrant$12.3MHQ - #23
Universal QuantumUniversal Quantum develops trapped-ion quantum computers with a modular architecture using electric field shuttling.
Trapped-Ion Qubits · Series A $100MTrapped-Ion QubitsSeries A$100MHQ - #24
Terra QuantumTerra Quantum develops quantum algorithms and hybrid quantum-classical software for optimization, simulation, and cryptography.
Quantum Software & Applications · Series A $75M
Quantum Software & ApplicationsSeries A$75MHQ - #25
QuandelaQuandela manufactures photonic quantum computers and single-photon sources for quantum computing and communication.
Photonic Qubits · Series B $53.5MPhotonic QubitsSeries B$53.5MHQ