Company lists · Data refreshed September 2026

Top 25 Quantum computing hardware companies based in the United States

Name: Quantum computing hardware companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 124 companies tracked

RevenueBase identified 124 quantum computing hardware companies headquartered in the United States as of September 2026 and tracks 4,103 professional contacts across them, including 1,931 with verified work emails. Chicago is the largest hub.

This list covers quantum computing hardware 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 17, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 17, 2026 86% judged on-target in blind review

124Companies

4,103Contacts tracked

1,931Verified emails

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The 25 largest quantum computing hardware companies based in the United States

Ranked by team size

Top 25 of 124 quantum computing hardware companies based in the United States, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to quantum computing hardware companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Quantinuum	Strong evidence	Broomfield, CO, United StatesHQ checked Sep 17, 2026	201-500	598 contacts →
	Strong evidence “Science led and enterprise driven, Quantinuum unites Cambridge Quantum’s best-in-class software with Honeywell Quantum Solutions’ high-performing trapped-ion hardware.” Source: RevenueBase Database · checked Sep 17, 2026
2	IONQ	Strong evidence	College Park, MD, United StatesHQ checked Sep 17, 2026	1,001-5,000	574 contacts →
	Strong evidence “IonQ, Inc.[NYSE: IONQ] is the world’s leading quantum platform and foundry - delivering integrated quantum solutions across computing, networking, sensing, and security.” Source: RevenueBase Database · checked Sep 17, 2026
3	Psiquantum	Strong evidence	Palo Alto, CA, United StatesHQ checked Sep 17, 2026	201-500	359 contacts →
	Strong evidence “Quantum computing will be a world-changing technology with the potential to unlock powerful advances in medicine, energy, finance and beyond.” Source: RevenueBase Database · checked Sep 17, 2026
4	Quantum Machines	Partial evidence	Claymont, United StatesHQ checked Sep 17, 2026	201-500	252 contacts →
	Partial evidence “Quantum Machines envisions a new technological age.” Source: RevenueBase Database · checked Sep 17, 2026
5	Infleqtion	Strong evidence	Louisville, CO, United StatesHQ checked Sep 17, 2026	201-500	211 contacts →
	Strong evidence “Infleqtion, Inc.(NYSE: INFQ) is a global leader in quantum technology, delivering neutral atom solutions for quantum computing, networking, sensing, and security.” Source: RevenueBase Database · checked Sep 17, 2026
6	Rigetti Computing	Strong evidence	Berkeley, CA, United StatesHQ checked Sep 17, 2026	51-200	171 contacts →
	Strong evidence “Rigetti is a pioneer in full-stack quantum computing.” Source: RevenueBase Database · checked Sep 17, 2026
7	Quera Computing INC	Strong evidence	Boston, MA, United StatesHQ checked Sep 17, 2026	51-200	142 contacts →
	Strong evidence “Quantum computing is moving from "one day" to "day one." QuEra Computing is leading that transition.” Source: RevenueBase Database · checked Sep 17, 2026
8	Atom Computing	Partial evidence	Berkeley, CA, United StatesHQ checked Sep 17, 2026	51-200	96 contacts →
	Partial evidence “We build scalable quantum computers with atomic arrays that empower our customers to achieve computational breakthroughs.” Source: RevenueBase Database · checked Sep 17, 2026
9	NTT Research	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 17, 2026	201-500	89 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 17, 2026
10	Quantum Computing INC	Strong evidence	Hoboken, NJ, United StatesHQ checked Sep 17, 2026	201-500	87 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 17, 2026
11	Vector Atomic	Strong evidence	Pleasanton, CA, United StatesHQ checked Sep 17, 2026	51-200	59 contacts →
	Strong evidence “Vector Atomic is commercializing quantum technology for applications including GPS-free navigation, telecommunications, and computing.” Source: RevenueBase Database · checked Sep 17, 2026
12	Quantum Circuits, INC	Strong evidence	New Haven, CT, United StatesHQ checked Sep 17, 2026	201-500	58 contacts →
	Strong evidence “Quantum Circuits, now D-Wave, is developing a full-stack gate-model quantum computing platform using superconducting devices and a modular, robust, and scalable architecture.” Source: RevenueBase Database · checked Sep 17, 2026
13	Maybell Quantum	Partial evidence	Denver, CO, United StatesHQ checked Sep 17, 2026	11-50	51 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 17, 2026
14	Montana Instruments	Strong evidence	Bozeman, MT, United StatesHQ checked Sep 17, 2026	11-50	38 contacts →
	Strong evidence “Montana Instruments manufactures high-precision electrical, optical, and cryogenic products for quantum computing, quantum education, quantum networking, and quantum materials…” Source: RevenueBase Database · checked Sep 17, 2026
15	QC Ware Corp	Strong evidence	Palo Alto, CA, United StatesHQ checked Sep 17, 2026	11-50	38 contacts →
	Strong evidence “QC Ware is a quantum computing software company building enterprise solutions.” Source: RevenueBase Database · checked Sep 17, 2026
16	SEEQC	Strong evidence	Elmsford, NY, United StatesHQ checked Sep 17, 2026	11-50	34 contacts →
	Strong evidence “SEEQC is developing the first digital quantum computing platform for global businesses.” Source: RevenueBase Database · checked Sep 17, 2026
17	Strangeworks	Partial evidence	Austin, TX, United StatesHQ checked Sep 17, 2026	11-50	31 contacts →
	Partial evidence “Strangeworks is an unconventional computing software company based in Austin, TX.” Source: RevenueBase Database · checked Sep 17, 2026
18	ALIRO	Partial evidence	Boston, MA, United StatesHQ checked Sep 17, 2026	11-50	26 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 17, 2026
19	HAIQU	Partial evidence	Brooklyn, United StatesHQ checked Sep 17, 2026	11-50	21 contacts →
	Partial evidence “Haiqu is a quantum software company developing a new application execution stack for all modalities of near-term quantum computers.” Source: RevenueBase Database · checked Sep 17, 2026
20	Atlantic Quantum	Partial evidence	Cambridge, MA, United StatesHQ checked Sep 17, 2026	11-50	20 contacts →
	Partial evidence “Atlantic Quantum is now part of Google Quantum AI.” Source: RevenueBase Database · checked Sep 17, 2026
21	Qbraid	Strong evidence	Chicago, IL, United StatesHQ checked Sep 17, 2026	11-50	19 contacts →
	Strong evidence “qBraid is the quantum cloud connecting developers, researchers, enterprises, and hardware partners.” Source: RevenueBase Database · checked Sep 17, 2026
22	Bluequbit	Partial evidence	Bay, CA, United StatesHQ checked Sep 17, 2026	11-50	17 contacts →
	Partial evidence “BlueQubit builds first-in-class quantum software for current and upcoming quantum computers.” Source: RevenueBase Database · checked Sep 17, 2026
23	Eeroq Corporation	Partial evidence	Chicago, IL, United StatesHQ checked Sep 17, 2026	11-50	16 contacts →
	Partial evidence “EeroQ is building a next-generation quantum computer using the technology of today.” Source: RevenueBase Database · checked Sep 17, 2026
24	Quoherent	Partial evidence	Winston Salem, NC, United StatesHQ checked Sep 17, 2026	1-10	14 contacts →
	Partial evidence “Quoherent's mission is to deploy the world’s first high-fidelity, scalable quantum processors on mobile platforms.” Source: RevenueBase Database · checked Sep 17, 2026
25	Secured Quantum Services	Partial evidence	Colorado Springs, CO, United StatesHQ checked Sep 17, 2026	11-50	13 contacts →
	Partial evidence “At Secured Quantum Services (SQS), we are at the forefront of building quantum-secure infrastructure for the future.” Source: RevenueBase Database · checked Sep 17, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: quantum computing hardware companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names quantum computing hardware companies.
Partial evidence: Its own public description names part of quantum computing hardware companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name quantum computing hardware companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 124 quantum computing hardware companies based in the United States

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Quantum computing hardware companies based in the United States at a glance

As of Sep 17, 2026

47.1%Verified-email coverage

33.1Average contacts per company

11-50Median size (employees)

6.5%Largest-city concentration · Chicago

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 124 companies.

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 computing hardware companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search 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 Smart Search, 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 computing hardware companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names quantum computing hardware companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among quantum computing hardware 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 its RevenueBase Smart Search 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, 1,931 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 17, 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

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names quantum computing hardware companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many quantum computing hardware companies are there based in the United States?

RevenueBase identified 124 quantum computing hardware 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 computing hardware companies?

Chicago leads with 8 headquartered companies, followed by Palo Alto (8) and Boston (7).

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 1,931 verified decision-maker contacts tracked across these 124 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 17, 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 Smart Search, 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.