# Quantum Companies

> Find the companies building quantum technology.

Quantum Companies lists 162 quantum companies. Updated 2026-11-07. Every page has a markdown copy: add `.md` to its URL, or send `Accept: text/markdown`. The home page copy is [index.md](https://quantumcompanies.fyi/index.md).

## Countries

- [United States](https://quantumcompanies.fyi/us.md): 46 quantum companies
- [Germany](https://quantumcompanies.fyi/de.md): 19 quantum companies
- [United Kingdom](https://quantumcompanies.fyi/gb.md): 18 quantum companies
- [Canada](https://quantumcompanies.fyi/ca.md): 14 quantum companies
- [Netherlands](https://quantumcompanies.fyi/nl.md): 10 quantum companies
- [France](https://quantumcompanies.fyi/fr.md): 9 quantum companies
- [Switzerland](https://quantumcompanies.fyi/ch.md): 7 quantum companies
- [Australia](https://quantumcompanies.fyi/au.md): 6 quantum companies
- [Denmark](https://quantumcompanies.fyi/dk.md): 5 quantum companies
- [Finland](https://quantumcompanies.fyi/fi.md): 5 quantum companies
- [Spain](https://quantumcompanies.fyi/es.md): 4 quantum companies
- [Austria](https://quantumcompanies.fyi/at.md): 3 quantum companies
- [Israel](https://quantumcompanies.fyi/il.md): 3 quantum companies
- [Italy](https://quantumcompanies.fyi/it.md): 2 quantum companies
- [Japan](https://quantumcompanies.fyi/jp.md): 2 quantum companies
- [Singapore](https://quantumcompanies.fyi/sg.md): 2 quantum companies
- [China](https://quantumcompanies.fyi/cn.md): 1 quantum company
- [Estonia](https://quantumcompanies.fyi/ee.md): 1 quantum company
- [India](https://quantumcompanies.fyi/in.md): 1 quantum company
- [South Korea](https://quantumcompanies.fyi/kr.md): 1 quantum company
- [Poland](https://quantumcompanies.fyi/pl.md): 1 quantum company
- [Romania](https://quantumcompanies.fyi/ro.md): 1 quantum company
- [Sweden](https://quantumcompanies.fyi/se.md): 1 quantum company

## Regions

- [England, United Kingdom](https://quantumcompanies.fyi/gb/england.md): 16 quantum companies
- [CA, United States](https://quantumcompanies.fyi/us/ca.md): 12 quantum companies
- [CO, United States](https://quantumcompanies.fyi/us/co.md): 11 quantum companies
- [ON, Canada](https://quantumcompanies.fyi/ca/on.md): 6 quantum companies
- [QC, Canada](https://quantumcompanies.fyi/ca/qc.md): 6 quantum companies
- [Munich, Germany](https://quantumcompanies.fyi/de/munich.md): 4 quantum companies
- [South Holland, Netherlands](https://quantumcompanies.fyi/nl/south-holland.md): 4 quantum companies
- [MA, United States](https://quantumcompanies.fyi/us/ma.md): 4 quantum companies
- [NY, United States](https://quantumcompanies.fyi/us/ny.md): 4 quantum companies
- [NSW, Australia](https://quantumcompanies.fyi/au/nsw.md): 3 quantum companies
- [Zurich, Switzerland](https://quantumcompanies.fyi/ch/zurich.md): 3 quantum companies
- [Capital Region, Denmark](https://quantumcompanies.fyi/dk/capital-region.md): 3 quantum companies
- [Île-de-France, France](https://quantumcompanies.fyi/fr/ile-de-france.md): 3 quantum companies
- [Delft, Netherlands](https://quantumcompanies.fyi/nl/delft.md): 3 quantum companies
- [TX, United States](https://quantumcompanies.fyi/us/tx.md): 3 quantum companies
- [Vienna, Austria](https://quantumcompanies.fyi/at/vienna.md): 2 quantum companies
- [VIC, Australia](https://quantumcompanies.fyi/au/vic.md): 2 quantum companies
- [Berlin, Germany](https://quantumcompanies.fyi/de/berlin.md): 2 quantum companies
- [Stuttgart, Germany](https://quantumcompanies.fyi/de/stuttgart.md): 2 quantum companies
- [Espoo, Finland](https://quantumcompanies.fyi/fi/espoo.md): 2 quantum companies
- [Tokyo, Japan](https://quantumcompanies.fyi/jp/tokyo.md): 2 quantum companies
- [Enschede, Netherlands](https://quantumcompanies.fyi/nl/enschede.md): 2 quantum companies
- [Singapore, Singapore](https://quantumcompanies.fyi/sg/singapore.md): 2 quantum companies
- [MT, United States](https://quantumcompanies.fyi/us/mt.md): 2 quantum companies
- [NJ, United States](https://quantumcompanies.fyi/us/nj.md): 2 quantum companies
- [Innsbruck, Austria](https://quantumcompanies.fyi/at/innsbruck.md): 1 quantum company
- [SA, Australia](https://quantumcompanies.fyi/au/sa.md): 1 quantum company
- [AB, Canada](https://quantumcompanies.fyi/ca/ab.md): 1 quantum company
- [Metro Vancouver Regional District, Canada](https://quantumcompanies.fyi/ca/metro-vancouver-regional-district.md): 1 quantum company
- [Geneva, Switzerland](https://quantumcompanies.fyi/ch/geneva.md): 1 quantum company
- [Muttenz, Switzerland](https://quantumcompanies.fyi/ch/muttenz.md): 1 quantum company
- [Rorschach, Switzerland](https://quantumcompanies.fyi/ch/rorschach.md): 1 quantum company
- [Vaud, Switzerland](https://quantumcompanies.fyi/ch/vaud.md): 1 quantum company
- [Hefei, China](https://quantumcompanies.fyi/cn/hefei.md): 1 quantum company
- [Fürth, Germany](https://quantumcompanies.fyi/de/furth.md): 1 quantum company
- [Garching, Germany](https://quantumcompanies.fyi/de/garching.md): 1 quantum company
- [Haar, Germany](https://quantumcompanies.fyi/de/haar.md): 1 quantum company
- [Hamburg, Germany](https://quantumcompanies.fyi/de/hamburg.md): 1 quantum company
- [Jena, Germany](https://quantumcompanies.fyi/de/jena.md): 1 quantum company
- [Karlsruhe, Germany](https://quantumcompanies.fyi/de/karlsruhe.md): 1 quantum company
- [Leipzig, Germany](https://quantumcompanies.fyi/de/leipzig.md): 1 quantum company
- [Martinsried, Germany](https://quantumcompanies.fyi/de/martinsried.md): 1 quantum company
- [Siegen, Germany](https://quantumcompanies.fyi/de/siegen.md): 1 quantum company
- [Thuringia, Germany](https://quantumcompanies.fyi/de/thuringia.md): 1 quantum company
- [Ulm, Germany](https://quantumcompanies.fyi/de/ulm.md): 1 quantum company
- [Birkerød, Denmark](https://quantumcompanies.fyi/dk/birkerod.md): 1 quantum company
- [Copenhagen, Denmark](https://quantumcompanies.fyi/dk/copenhagen.md): 1 quantum company
- [Tallinn, Estonia](https://quantumcompanies.fyi/ee/tallinn.md): 1 quantum company
- [Barcelona, Spain](https://quantumcompanies.fyi/es/barcelona.md): 1 quantum company
- [Basque Country, Spain](https://quantumcompanies.fyi/es/basque-country.md): 1 quantum company
- [Castelldefels, Spain](https://quantumcompanies.fyi/es/castelldefels.md): 1 quantum company
- [Valencia, Spain](https://quantumcompanies.fyi/es/valencia.md): 1 quantum company
- [Helsinki, Finland](https://quantumcompanies.fyi/fi/helsinki.md): 1 quantum company
- [Tampere, Finland](https://quantumcompanies.fyi/fi/tampere.md): 1 quantum company
- [Uusimaa, Finland](https://quantumcompanies.fyi/fi/uusimaa.md): 1 quantum company
- [Besancon, France](https://quantumcompanies.fyi/fr/besancon.md): 1 quantum company
- [Courbevoie, France](https://quantumcompanies.fyi/fr/courbevoie.md): 1 quantum company
- [Massy, France](https://quantumcompanies.fyi/fr/massy.md): 1 quantum company
- [Palaiseau, France](https://quantumcompanies.fyi/fr/palaiseau.md): 1 quantum company
- [Paris, France](https://quantumcompanies.fyi/fr/paris.md): 1 quantum company
- [Rennes, France](https://quantumcompanies.fyi/fr/rennes.md): 1 quantum company
- [Scotland, United Kingdom](https://quantumcompanies.fyi/gb/scotland.md): 1 quantum company
- [WLN, United Kingdom](https://quantumcompanies.fyi/gb/wln.md): 1 quantum company
- [Migdal HaEmek, Israel](https://quantumcompanies.fyi/il/migdal-haemek.md): 1 quantum company
- [Ness Ziona, Israel](https://quantumcompanies.fyi/il/ness-ziona.md): 1 quantum company
- [Tel-Aviv, Israel](https://quantumcompanies.fyi/il/tel-aviv.md): 1 quantum company
- [Bengaluru, India](https://quantumcompanies.fyi/in/bengaluru.md): 1 quantum company
- [Lombardy, Italy](https://quantumcompanies.fyi/it/lombardy.md): 1 quantum company
- [Sarcedo, Italy](https://quantumcompanies.fyi/it/sarcedo.md): 1 quantum company
- [Seoul, South Korea](https://quantumcompanies.fyi/kr/seoul.md): 1 quantum company
- [Leiden, Netherlands](https://quantumcompanies.fyi/nl/leiden.md): 1 quantum company
- [Warszawa, Poland](https://quantumcompanies.fyi/pl/warszawa.md): 1 quantum company
- [Bucharest, Romania](https://quantumcompanies.fyi/ro/bucharest.md): 1 quantum company
- [Gothenburg, Sweden](https://quantumcompanies.fyi/se/gothenburg.md): 1 quantum company
- [AZ, United States](https://quantumcompanies.fyi/us/az.md): 1 quantum company
- [IL, United States](https://quantumcompanies.fyi/us/il.md): 1 quantum company
- [MD, United States](https://quantumcompanies.fyi/us/md.md): 1 quantum company
- [MI, United States](https://quantumcompanies.fyi/us/mi.md): 1 quantum company
- [MN, United States](https://quantumcompanies.fyi/us/mn.md): 1 quantum company
- [NH, United States](https://quantumcompanies.fyi/us/nh.md): 1 quantum company
- [TN, United States](https://quantumcompanies.fyi/us/tn.md): 1 quantum company
- [WY, United States](https://quantumcompanies.fyi/us/wy.md): 1 quantum company

## Quantum companies by city

- [Boulder, CO, United States](https://quantumcompanies.fyi/us/co/boulder.md): 6 quantum companies
- [Waterloo, ON, Canada](https://quantumcompanies.fyi/ca/on/waterloo.md): 4 quantum companies
- [Montreal, QC, Canada](https://quantumcompanies.fyi/ca/qc/montreal.md): 4 quantum companies
- [Munich, Munich, Germany](https://quantumcompanies.fyi/de/munich/munich.md): 4 quantum companies
- [Zurich, Zurich, Switzerland](https://quantumcompanies.fyi/ch/zurich/zurich.md): 3 quantum companies
- [Paris, Île-de-France, France](https://quantumcompanies.fyi/fr/ile-de-france/paris.md): 3 quantum companies
- [London, England, United Kingdom](https://quantumcompanies.fyi/gb/england/london.md): 3 quantum companies
- [Delft, Delft, Netherlands](https://quantumcompanies.fyi/nl/delft/delft.md): 3 quantum companies
- [Delft, South Holland, Netherlands](https://quantumcompanies.fyi/nl/south-holland/delft.md): 3 quantum companies
- [Vienna, Vienna, Austria](https://quantumcompanies.fyi/at/vienna/vienna.md): 2 quantum companies
- [Sherbrooke, QC, Canada](https://quantumcompanies.fyi/ca/qc/sherbrooke.md): 2 quantum companies
- [Berlin, Berlin, Germany](https://quantumcompanies.fyi/de/berlin/berlin.md): 2 quantum companies
- [Stuttgart, Stuttgart, Germany](https://quantumcompanies.fyi/de/stuttgart/stuttgart.md): 2 quantum companies
- [Copenhagen, Capital Region, Denmark](https://quantumcompanies.fyi/dk/capital-region/copenhagen.md): 2 quantum companies
- [Espoo, Espoo, Finland](https://quantumcompanies.fyi/fi/espoo/espoo.md): 2 quantum companies
- [Cambridge, England, United Kingdom](https://quantumcompanies.fyi/gb/england/cambridge.md): 2 quantum companies
- [Oxford, England, United Kingdom](https://quantumcompanies.fyi/gb/england/oxford.md): 2 quantum companies
- [Tokyo, Tokyo, Japan](https://quantumcompanies.fyi/jp/tokyo/tokyo.md): 2 quantum companies
- [Enschede, Enschede, Netherlands](https://quantumcompanies.fyi/nl/enschede/enschede.md): 2 quantum companies
- [Singapore, Singapore, Singapore](https://quantumcompanies.fyi/sg/singapore/singapore.md): 2 quantum companies
- [Goleta, CA, United States](https://quantumcompanies.fyi/us/ca/goleta.md): 2 quantum companies
- [Cambridge, MA, United States](https://quantumcompanies.fyi/us/ma/cambridge.md): 2 quantum companies
- [Bozeman, MT, United States](https://quantumcompanies.fyi/us/mt/bozeman.md): 2 quantum companies
- [Innsbruck, Innsbruck, Austria](https://quantumcompanies.fyi/at/innsbruck/innsbruck.md): 1 quantum company
- [Adelaide, NSW, Australia](https://quantumcompanies.fyi/au/nsw/adelaide.md): 1 quantum company
- [Canberra, NSW, Australia](https://quantumcompanies.fyi/au/nsw/canberra.md): 1 quantum company
- [Sydney, NSW, Australia](https://quantumcompanies.fyi/au/nsw/sydney.md): 1 quantum company
- [Adelaide, SA, Australia](https://quantumcompanies.fyi/au/sa/adelaide.md): 1 quantum company
- [Canberra, VIC, Australia](https://quantumcompanies.fyi/au/vic/canberra.md): 1 quantum company
- [Melbourne, VIC, Australia](https://quantumcompanies.fyi/au/vic/melbourne.md): 1 quantum company
- [Edmonton, AB, Canada](https://quantumcompanies.fyi/ca/ab/edmonton.md): 1 quantum company
- [Burnaby, Metro Vancouver Regional District, Canada](https://quantumcompanies.fyi/ca/metro-vancouver-regional-district/burnaby.md): 1 quantum company
- [Ottawa, ON, Canada](https://quantumcompanies.fyi/ca/on/ottawa.md): 1 quantum company
- [Toronto, ON, Canada](https://quantumcompanies.fyi/ca/on/toronto.md): 1 quantum company
- [Geneva, Geneva, Switzerland](https://quantumcompanies.fyi/ch/geneva/geneva.md): 1 quantum company
- [Muttenz, Muttenz, Switzerland](https://quantumcompanies.fyi/ch/muttenz/muttenz.md): 1 quantum company
- [Rorschach, Rorschach, Switzerland](https://quantumcompanies.fyi/ch/rorschach/rorschach.md): 1 quantum company
- [Lausanne, Vaud, Switzerland](https://quantumcompanies.fyi/ch/vaud/lausanne.md): 1 quantum company
- [Hefei, Hefei, China](https://quantumcompanies.fyi/cn/hefei/hefei.md): 1 quantum company
- [Fürth, Fürth, Germany](https://quantumcompanies.fyi/de/furth/furth.md): 1 quantum company
- [Garching, Garching, Germany](https://quantumcompanies.fyi/de/garching/garching.md): 1 quantum company
- [Haar, Haar, Germany](https://quantumcompanies.fyi/de/haar/haar.md): 1 quantum company
- [Hamburg, Hamburg, Germany](https://quantumcompanies.fyi/de/hamburg/hamburg.md): 1 quantum company
- [Jena, Jena, Germany](https://quantumcompanies.fyi/de/jena/jena.md): 1 quantum company
- [Karlsruhe, Karlsruhe, Germany](https://quantumcompanies.fyi/de/karlsruhe/karlsruhe.md): 1 quantum company
- [Leipzig, Leipzig, Germany](https://quantumcompanies.fyi/de/leipzig/leipzig.md): 1 quantum company
- [Martinsried, Martinsried, Germany](https://quantumcompanies.fyi/de/martinsried/martinsried.md): 1 quantum company
- [Siegen, Siegen, Germany](https://quantumcompanies.fyi/de/siegen/siegen.md): 1 quantum company
- [Jena, Thuringia, Germany](https://quantumcompanies.fyi/de/thuringia/jena.md): 1 quantum company
- [Ulm, Ulm, Germany](https://quantumcompanies.fyi/de/ulm/ulm.md): 1 quantum company
- [Birkerød, Birkerød, Denmark](https://quantumcompanies.fyi/dk/birkerod/birkerod.md): 1 quantum company
- [Lyngby, Capital Region, Denmark](https://quantumcompanies.fyi/dk/capital-region/lyngby.md): 1 quantum company
- [Copenhagen, Copenhagen, Denmark](https://quantumcompanies.fyi/dk/copenhagen/copenhagen.md): 1 quantum company
- [Tallinn, Tallinn, Estonia](https://quantumcompanies.fyi/ee/tallinn/tallinn.md): 1 quantum company
- [Barcelona, Barcelona, Spain](https://quantumcompanies.fyi/es/barcelona/barcelona.md): 1 quantum company
- [Bilbao, Basque Country, Spain](https://quantumcompanies.fyi/es/basque-country/bilbao.md): 1 quantum company
- [Castelldefels, Castelldefels, Spain](https://quantumcompanies.fyi/es/castelldefels/castelldefels.md): 1 quantum company
- [Valencia, Valencia, Spain](https://quantumcompanies.fyi/es/valencia/valencia.md): 1 quantum company
- [Helsinki, Helsinki, Finland](https://quantumcompanies.fyi/fi/helsinki/helsinki.md): 1 quantum company
- [Tampere, Tampere, Finland](https://quantumcompanies.fyi/fi/tampere/tampere.md): 1 quantum company
- [Espoo, Uusimaa, Finland](https://quantumcompanies.fyi/fi/uusimaa/espoo.md): 1 quantum company
- [Besancon, Besancon, France](https://quantumcompanies.fyi/fr/besancon/besancon.md): 1 quantum company
- [Courbevoie, Courbevoie, France](https://quantumcompanies.fyi/fr/courbevoie/courbevoie.md): 1 quantum company
- [Massy, Massy, France](https://quantumcompanies.fyi/fr/massy/massy.md): 1 quantum company
- [Palaiseau, Palaiseau, France](https://quantumcompanies.fyi/fr/palaiseau/palaiseau.md): 1 quantum company
- [Paris, Paris, France](https://quantumcompanies.fyi/fr/paris/paris.md): 1 quantum company
- [Rennes, Rennes, France](https://quantumcompanies.fyi/fr/rennes/rennes.md): 1 quantum company
- [Bristol, England, United Kingdom](https://quantumcompanies.fyi/gb/england/bristol.md): 1 quantum company
- [Brixham, England, United Kingdom](https://quantumcompanies.fyi/gb/england/brixham.md): 1 quantum company
- [Cirencester, England, United Kingdom](https://quantumcompanies.fyi/gb/england/cirencester.md): 1 quantum company
- [Didcot, England, United Kingdom](https://quantumcompanies.fyi/gb/england/didcot.md): 1 quantum company
- [Edinburgh, England, United Kingdom](https://quantumcompanies.fyi/gb/england/edinburgh.md): 1 quantum company
- [England, England, United Kingdom](https://quantumcompanies.fyi/gb/england/england.md): 1 quantum company
- [Glasgow, England, United Kingdom](https://quantumcompanies.fyi/gb/england/glasgow.md): 1 quantum company
- [Hayward's Heath, England, United Kingdom](https://quantumcompanies.fyi/gb/england/haywards-heath.md): 1 quantum company
- [Southampton, England, United Kingdom](https://quantumcompanies.fyi/gb/england/southampton.md): 1 quantum company
- [Glasgow, Scotland, United Kingdom](https://quantumcompanies.fyi/gb/scotland/glasgow.md): 1 quantum company
- [Livingston, WLN, United Kingdom](https://quantumcompanies.fyi/gb/wln/livingston.md): 1 quantum company
- [Migdal HaEmek, Migdal HaEmek, Israel](https://quantumcompanies.fyi/il/migdal-haemek/migdal-haemek.md): 1 quantum company
- [Ness Ziona, Ness Ziona, Israel](https://quantumcompanies.fyi/il/ness-ziona/ness-ziona.md): 1 quantum company
- [Tel-Aviv, Tel-Aviv, Israel](https://quantumcompanies.fyi/il/tel-aviv/tel-aviv.md): 1 quantum company
- [Bengaluru, Bengaluru, India](https://quantumcompanies.fyi/in/bengaluru/bengaluru.md): 1 quantum company
- [Milano, Lombardy, Italy](https://quantumcompanies.fyi/it/lombardy/milano.md): 1 quantum company
- [Sarcedo, Sarcedo, Italy](https://quantumcompanies.fyi/it/sarcedo/sarcedo.md): 1 quantum company
- [Seoul, Seoul, South Korea](https://quantumcompanies.fyi/kr/seoul/seoul.md): 1 quantum company
- [Leiden, Leiden, Netherlands](https://quantumcompanies.fyi/nl/leiden/leiden.md): 1 quantum company
- [The Hague, South Holland, Netherlands](https://quantumcompanies.fyi/nl/south-holland/the-hague.md): 1 quantum company
- [Warszawa, Warszawa, Poland](https://quantumcompanies.fyi/pl/warszawa/warszawa.md): 1 quantum company
- [Bucharest, Bucharest, Romania](https://quantumcompanies.fyi/ro/bucharest/bucharest.md): 1 quantum company
- [Gothenburg, Gothenburg, Sweden](https://quantumcompanies.fyi/se/gothenburg/gothenburg.md): 1 quantum company
- [Tempe, AZ, United States](https://quantumcompanies.fyi/us/az/tempe.md): 1 quantum company
- [Berkeley, CA, United States](https://quantumcompanies.fyi/us/ca/berkeley.md): 1 quantum company
- [California, CA, United States](https://quantumcompanies.fyi/us/ca/california.md): 1 quantum company
- [Monrovia, CA, United States](https://quantumcompanies.fyi/us/ca/monrovia.md): 1 quantum company
- [Mountain View, CA, United States](https://quantumcompanies.fyi/us/ca/mountain-view.md): 1 quantum company
- [Pasadena, CA, United States](https://quantumcompanies.fyi/us/ca/pasadena.md): 1 quantum company
- [Pleasanton, CA, United States](https://quantumcompanies.fyi/us/ca/pleasanton.md): 1 quantum company
- [San Diego, CA, United States](https://quantumcompanies.fyi/us/ca/san-diego.md): 1 quantum company
- [San Jose, CA, United States](https://quantumcompanies.fyi/us/ca/san-jose.md): 1 quantum company
- [San Rafael, CA, United States](https://quantumcompanies.fyi/us/ca/san-rafael.md): 1 quantum company

## Categories

- [Quantum components](https://quantumcompanies.fyi/category/quantum-components.md): 69 quantum companies
- [Quantum hardware](https://quantumcompanies.fyi/category/quantum-hardware.md): 40 quantum companies
- [Quantum sensing and metrology](https://quantumcompanies.fyi/category/quantum-sensing.md): 32 quantum companies
- [Quantum software and algorithms](https://quantumcompanies.fyi/category/quantum-software.md): 28 quantum companies
- [Quantum networking and QKD](https://quantumcompanies.fyi/category/quantum-networking.md): 27 quantum companies
- [Quantum consulting and training](https://quantumcompanies.fyi/category/quantum-consulting.md): 20 quantum companies
- [Quantum cloud access](https://quantumcompanies.fyi/category/quantum-cloud.md): 17 quantum companies
- [Post-quantum cryptography vendors](https://quantumcompanies.fyi/category/post-quantum-cryptography.md): 15 quantum companies

## Free tools

- [Quantum cloud cost estimator](https://quantumcompanies.fyi/tools/quantum-cloud-cost-estimator.md): Estimate per-shot and per-task costs for AWS Braket, IBM Quantum and Azure Quantum using published pricing.
- [Post-quantum migration deadline checker](https://quantumcompanies.fyi/tools/post-quantum-migration-deadline-checker.md): Check which NIST FIPS 203/204/205, NSA CNSA 2.0 and US OMB M-26-15 deadlines apply to your organization.

## Books and kits

Affiliate product picks. Each price is the one seen on the date shown beside it. [All categories](https://quantumcompanies.fyi/products); [affiliate disclosure](https://quantumcompanies.fyi/affiliate-disclosure).

- [Post-quantum cryptography](https://quantumcompanies.fyi/products/post-quantum-crypto): Books on the cryptographic algorithms that replace RSA and ECC, and on planning a migration to them. 1 product.
- [Quantum computing foundations](https://quantumcompanies.fyi/products/quantum-foundations): Textbooks and general guides that explain how quantum computing works, from first principles to core theory. 7 products.
- [Quantum programming guides](https://quantumcompanies.fyi/products/quantum-programming): Hands-on books for developers: SDKs, code samples and algorithm walkthroughs for real quantum computers. 6 products.

## Academy

- [Quantum technology foundations for buyers](https://quantumcompanies.fyi/academy/quantum-technology-foundations.md): Learn what quantum companies sell, how qubits and modalities differ, why qubit count is only one number and how to read a quantum company listing.
- [Evaluate quantum computing vendors and cloud access](https://quantumcompanies.fyi/academy/evaluate-quantum-computing-vendors.md): A practical method for comparing quantum computing vendors: define the workload, compare devices on fair tests, price cloud access and question the vendor before you sign.
- [Buy post-quantum cryptography and quantum security products](https://quantumcompanies.fyi/academy/post-quantum-cryptography-procurement.md): The quantum threat to public-key cryptography, the NIST standards and CNSA 2.0, how to check vendor validation claims, and the limits of QKD and quantum random number generators.

Each course ends with an exam and a certificate of completion. Check a certificate's verification code at `https://quantumcompanies.fyi/api/v1/certificates/{code}`.

## Quantum buying guides

- [Quantum technology glossary](https://quantumcompanies.fyi/guides/glossary.md): Plain-language definitions of key terms in quantum computing, sensing, networking, cryptography and components. Updated quarterly.
- [How to buy quantum cloud time](https://quantumcompanies.fyi/guides/how-to-buy-quantum-cloud-time.md): Compare AWS Braket, Azure Quantum and IBM Quantum Platform pricing, access models and free tiers for gate-model QPUs, annealers and simulators.
- [How to vet a quantum vendor](https://quantumcompanies.fyi/guides/how-to-vet-a-quantum-vendor.md): A procurement checklist for evaluating quantum hardware, software, cloud and services vendors. Technical, commercial and compliance questions to ask before you sign.
- [Post-quantum cryptography migration timeline](https://quantumcompanies.fyi/guides/post-quantum-cryptography-migration-timeline.md): NIST FIPS 203/204/205 (ML-KEM, ML-DSA, SLH-DSA), NSA CNSA 2.0 and US OMB M-26-15 deadlines for federal and commercial migration.
- [Quantum careers and skills](https://quantumcompanies.fyi/guides/quantum-careers-and-skills.md): Roles, skills, salaries and hiring trends for quantum computing, sensing, networking and cryptography. University programs, certifications and transition paths from classical tech.
- [Quantum computing modalities compared](https://quantumcompanies.fyi/guides/quantum-computing-modalities-compared.md): Compare superconducting, trapped-ion, neutral-atom, photonic, spin-qubit and topological quantum computers by qubit count, fidelity, connectivity and cloud availability.
- [Quantum funding and market data 2025](https://quantumcompanies.fyi/guides/quantum-funding-and-market-data-2025.md): Global public and private investment in quantum technology. Government programs, venture capital, M&A and revenue estimates from McKinsey, BCG, PitchBook and government sources.
- [Quantum sensing use cases](https://quantumcompanies.fyi/guides/quantum-sensing-use-cases.md): Real-world applications of quantum magnetometers, gravimeters, atomic clocks and inertial sensors in defense, healthcare, navigation and resource exploration.

## About this site

- [About Quantum Companies](https://quantumcompanies.fyi/about.md): What Quantum Companies is, where its data comes from, and how a listing is checked.
- [Contact Quantum Companies](https://quantumcompanies.fyi/contact.md): How to reach Quantum Companies: our email address, how fast we reply, and how to add or fix a listing.
- [Link exchange with Quantum Companies](https://quantumcompanies.fyi/link-exchange.md): Swap links with Quantum Companies for free. You link to us. We check the link. An approved site gets a partners page link, a guide mention, or a blog mention.
- [Quantum Companies briefing](https://quantumcompanies.fyi/newsletter): Occasional notes on vendor selection, modality comparison and quantum procurement.

## Data sources

- [Listing enrichment](https://quantumcompanies.fyi): license source, refreshed manual
- [Overture Maps](https://docs.overturemaps.org/attribution/): license CDLA-Permissive-2.0 / ODbL; retain the licence and attribution for each source record., refreshed monthly
- [Business websites](https://quantumcompanies.fyi/): license Business website facts; website text and images retain their original rights., refreshed manual

## API

- [OpenAPI 3.1 description](https://quantumcompanies.fyi/api/v1/openapi.json): the read API as JSON
- [API guide](https://quantumcompanies.fyi/developers): endpoints, examples, rate limits and how to credit the data
- [MCP server card](https://quantumcompanies.fyi/.well-known/mcp/server-card.json): the MCP server at https://quantumcompanies.fyi/mcp and its tools
- [Agent card](https://quantumcompanies.fyi/.well-known/agent-card.json): the A2A agent at https://quantumcompanies.fyi/a2a and its skills
- [Agent skills](https://quantumcompanies.fyi/.well-known/agent-skills/index.json): a skill that explains the API and the MCP server
- [API catalog](https://quantumcompanies.fyi/.well-known/api-catalog): the API description and the guide as an RFC 9727 linkset
- [WebMCP manifest](https://quantumcompanies.fyi/webmcp): the tools as a manifest

## Optional

- [Every quantum company with its facts](https://quantumcompanies.fyi/llms-full.txt)
- [Sitemap](https://quantumcompanies.fyi/sitemap.xml): every indexable page