Company lists · Data refreshed September 2026
Top 25 Quantum AI companies based in the United States
RevenueBase identified 301 quantum AI companies headquartered in the United States as of September 2026 and tracks 5,421 professional contacts across them, including 2,148 with verified work emails and 1,914 with mobile numbers. New York is the largest hub.
This list covers quantum AI companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest quantum AI companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | QuantinuumPartial evidence | 598 | |||
“Science led and enterprise driven, Quantinuum unites Cambridge Quantum’s best-in-class software with Honeywell Quantum Solutions’ high-performing trapped-ion hardware.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | IONQPartial evidence | 574 | |||
“IonQ, Inc.[NYSE: IONQ] is the world’s leading quantum platform and foundry - delivering integrated quantum solutions across computing, networking, sensing, and security.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | PsiquantumPartial evidence | 359 | |||
“Quantum computing will be a world-changing technology with the potential to unlock powerful advances in medicine, energy, finance and beyond.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 335 | ||||
“In the tech and data intelligence worlds, a sandbox is where innovation is born.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | Quantum MachinesPartial evidence | 252 | |||
“Quantum Machines envisions a new technological age.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | Xtalpi INCStrong evidence | 224 | |||
“We are a quantum physics-based, AI-powered drug R&D company with the mission to revolutionize drug discovery and development by improving the speed, scale, novelty and success…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | InfleqtionPartial evidence | 211 | |||
“Infleqtion, Inc.(NYSE: INFQ) is a global leader in quantum technology, delivering neutral atom solutions for quantum computing, networking, sensing, and security.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | Rigetti ComputingPartial evidence | 171 | |||
“Rigetti is a pioneer in full-stack quantum computing.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | Quera Computing INCPartial evidence | 142 | |||
“Quantum computing is moving from "one day" to "day one." QuEra Computing is leading that transition.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 96 | ||||
“We build scalable quantum computers with atomic arrays that empower our customers to achieve computational breakthroughs.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | NTT ResearchIndirect evidence | 89 | |||
“Launched in 2019, NTT Research is a Silicon Valley-based startup dedicated to conducting fundamental research in the fields of physics, cryptography and medical informatics with a…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | Quantum Computing INCPartial evidence | 87 | |||
“Quantum Computing Inc.(Nasdaq: QUBT) is a quantum optics and integrated photonics company focused on delivering accessible, scalable, and cost-effective quantum machines and…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | Vector AtomicPartial evidence | 59 | |||
“Vector Atomic is commercializing quantum technology for applications including GPS-free navigation, telecommunications, and computing.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | Maybell QuantumPartial evidence | 51 | |||
“Building the infrastructure for a quantum future so you can cool more with less Our mission is to deliver the world’s best tools to solve the toughest quantum challenges, offering…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 50 | ||||
“Fractional AI is focused on putting frontier AI to work.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 38 | ||||
“QC Ware is a quantum computing software company building enterprise solutions.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | SEEQCPartial evidence | 34 | |||
“SEEQC is developing the first digital quantum computing platform for global businesses.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | StrangeworksIndirect evidence | 31 | |||
“Strangeworks is an unconventional computing software company based in Austin, TX.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | SmartgatevcPartial evidence | 31 | |||
“SmartGateVC is a SoCal and Armenia based VC with a focus on early stage investments in Physical AI/Robotics, Neurotech/Brain-Computer Interfaces and Cybersecurity.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | 26 | ||||
“Aliro, The Quantum Networking Company®, offers AliroNet® to run entanglement-based Quantum Networks for applications such as Quantum Secure Communications (QSC), secure access to…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | 24 | ||||
“Entanglement is a next-generation artificial intelligence company fusing quantum computing with machine learning to solve previously unsolvable problems to drive human advancement.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | Gigajot Technology INCPartial evidence | 23 | |||
“We invented the Quanta Image Sensor (QIS), marking the dawn of a new era in imaging.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | QsimulatePartial evidence | 22 | |||
“QSimulate is reshaping the Future of Computational Drug Discovery by providing revolutionary quantum-powered simulation solutions that reduce R&D timelines and increase the…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | HAIQUPartial evidence | 21 | |||
“Haiqu is a quantum software company developing a new application execution stack for all modalities of near-term quantum computers.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | AtommapStrong evidence | 20 | |||
“Atommap invents therapeutic molecules using quantum physics, AI, and computation-driven design at atomic precision.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 301 quantum AI companies based in the United States
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Quantum AI companies based in the United States at a glance
As of Sep 5, 2026Companies by employee count
Verified emails by last verification
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among quantum AI companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “quantum AI companies”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among quantum AI companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 2,148 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 5, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
How many quantum AI companies are there based in the United States?
RevenueBase identified 301 quantum AI companies headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Quantinuum, headquartered in Broomfield, tops this list with the largest team on record.
Which city has the most quantum AI companies?
New York leads with 20 headquartered companies, followed by Palo Alto (18) and San Francisco (13).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 2,148 verified decision-maker contacts tracked across these 301 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 5, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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