Company lists · Data refreshed September 2026
Top 25 Quantum algorithm developers worldwide
RevenueBase identified 523 quantum algorithm developers worldwide as of September 2026 and tracks 8,501 professional contacts across them, including 3,488 with verified work emails. The United States is the largest market and London the largest hub.
This list covers quantum algorithm developers worldwide, 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 21, 2026. Country and city lists for quantum algorithm developers follow the table.
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.
The 25 largest quantum algorithm developers worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 598 contacts → | ||||
Partial 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 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 574 contacts → | ||||
Partial 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 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 350 contacts → | ||||
Partial evidence “IQM is pioneering the future of superconducting quantum computers.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 294 contacts → | ||||
Partial evidence “We build Programmable Quantum Simulators and Quantum Computers made of 2D and 3D Atomic Arrays.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 292 contacts → | ||||
Partial evidence “Xanadu Quantum Technologies Limited is a Canadian photonic quantum computing company with the mission to build quantum computers that are useful and available to people everywhere.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 252 contacts → | ||||
Partial evidence “Quantum Machines envisions a new technological age.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 211 contacts → | ||||
Partial 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 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 200 contacts → | ||||
Partial evidence “Alice & Bob is a quantum computing company based in Paris and Boston whose goal is to create the first universal, fault-tolerant quantum computer.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 171 contacts → | ||||
Partial evidence “Rigetti is a pioneer in full-stack quantum computing.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 159 contacts → | ||||
Partial evidence “Based in beautiful Vancouver, Canada, Photonic is delivering scalable, distributed, and fault-tolerant quantum computing and networking technologies.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 149 contacts → | ||||
Partial evidence “Quandela specialises in the production of photon-based quantum computing and cloud solutions, enabling organisations to achieve their quantum transformation.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 146 contacts → | ||||
Partial evidence “Quantum computing is poised to reshape our world by addressing the complex challenges we face today.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 144 contacts → | ||||
Partial evidence “The fragility of qubits means today's quantum computers fail under an avalanche of data errors long before they reach utility-scale.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 142 contacts → | ||||
Partial evidence “Quantum computing is moving from "one day" to "day one." QuEra Computing is leading that transition.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 116 contacts → | ||||
Partial evidence “planqc's quantum computers store information in individual atoms – nature's best qubits.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 104 contacts → | ||||
Partial evidence “Welcome to Classiq - Leading Quantum Computing Software Inspired by traditional semiconductor design automation, Classiq combines deep quantum expertise with novel implementation…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 95 contacts → | ||||
Partial evidence “QWorld [Association] is a non-profit global organization that brings quantum computing researchers and enthusiasts together.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 87 contacts → | ||||
Partial evidence “A quantum computer harnesses the fundamental forces that govern the physical world.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 86 contacts → | ||||
Partial evidence “QUANT AI Lab is a European technology company that industrializes AI to deliver measurable, sustainable performance across Finance and Operations.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 85 contacts → | ||||
Partial evidence “Terra Quantum is a leading quantum technology company based in Germany and Switzerland.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 79 contacts → | ||||
Partial evidence “Founded in 2019, we specialize in analog quantum computing, developing full-stack quantum computers based on fluxonium qubits, a robust, long-coherence architecture designed to…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 77 contacts → | ||||
Partial evidence “Quobly is a quantum computing company developing silicon-based quantum computers using proven semiconductor manufacturing processes.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 75 contacts → | ||||
Partial evidence “Silicon Quantum Computing (SQC) is at the forefront of global efforts to deliver a commercial-scale quantum system.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 72 contacts → | ||||
Partial evidence “eleQtron develops and operates quantum computers based on trapped ions, RF control and Magnetic Gradient Induced Coupling (MAGIC).” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 70 contacts → | ||||
Partial evidence “Quasi un secolo fa, Albert Einstein e altri intrepidi studiosi cominciarono a studiare la materia quantistica.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
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 algorithm developers. 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 algorithm developers.
- Partial evidence
- Its own public description names part of quantum algorithm developers, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name quantum algorithm developers. 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 523 quantum algorithm developers worldwide
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Quantum algorithm developers worldwide at a glance
As of Sep 21, 2026Companies by employee count
Email recency is reported on each country list linked below.
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 algorithm developers, 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.
- Coverage
- Every country. Country and city lists for quantum algorithm developers are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “quantum algorithm developers”. 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 algorithm developers), 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 algorithm developers, and records with no verified work email.
- 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, 3,488 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 21, 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.
Quantum algorithm developers by location
4 lists · largest firstEvery Quantum algorithm developers list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
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 algorithm developers, 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 algorithm developers are there worldwide?
RevenueBase identified 523 quantum algorithm developers worldwide 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 country has the most quantum algorithm developers?
The United States leads with 88 companies, followed by India (51) and the United Kingdom (33). Every quantum algorithm developers list by country and city is linked on this page.
Which city has the most quantum algorithm developers?
London leads with 16 headquartered companies, followed by Hyderabad (9) and Paris (9).
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 3,488 verified decision-maker contacts tracked across these 523 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 21, 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.