An open dataset on quantum companies and research in India.

Datasets

Each dataset is a single JSON file. The companies and publications files are rebuilt when the registry refresh runs, and their cards show when the content last changed. The other files are snapshots that are not refreshed automatically; their cards show the date the data was collected. Licences differ by dataset and are listed in the API section.

The curated patent and funding-round files hold no rows at present. A row is added when the official patent record, or a dated press release that states the amount, round, date and lead investor, confirms it.

Research areas in the worldwide feeds

Main research area of each paper in the arXiv and Crossref snapshots above (28 May 2026). These feeds cover all countries, not India alone. Areas come from a keyword classifier applied to titles and abstracts, and each paper is counted once. The general area holds quantum papers that matched no specific area; papers the classifier could not place are left out.

• General physics with significant quantum content 343
• Quantum algorithms and complexity 54
• Foundations and quantum information theory 38
• Quantum machine learning 32
• Quantum error correction and fault tolerance 30
• Quantum sensing and metrology 28
• Qubits, devices, and materials 28
• Quantum communication, QKD, networks 26
• Quantum simulation 21
• Post-quantum cryptography 20

Scope

The Union Cabinet approved India's National Quantum Mission in April 2023 with an outlay of Rs 6,003.65 crore for 2023-24 to 2030-31 (PIB release). Quantum work in India spans academic groups, national laboratories, public sector units and private companies. This registry collects public records on Indian quantum companies in one place, together with open publication and patent data.

A company is listed when its legal entity can be identified and its quantum work is described in a public source; the inclusion criteria set out the rules. Academic groups and individual researchers are not listed as companies. They appear through the publication and researcher datasets.

How to use the data

• Browse and search the companies at /quantum-india/companies.
• Download any dataset from its card above, or read it through the JSON API.
• Cite https://rslquantum.com/quantum-india with the date of access. The Zenodo archive of the 28 May 2026 release is doi:10.5281/zenodo.20428508; several records in that release have since been removed or corrected here.
• Send additions or corrections to quantum-india@rslquantum.com. A company submission needs a CIN, a link to a primary source and a one-line description of the quantum work.

Sources and method

Company rows are curated by hand. Each row lists the sources used to check it, such as MCA records or PIB releases. A company cited solely through a third-party copy of MCA data is not published, and a row that cites no primary source for its quantum work is marked on the companies page. Tags such as NQM, DPIIT and FITT require a cited source that supports them. Candidates that have not been checked are kept out of the published files.

The publication list comes from OpenAlex: works published in the last 30 days with at least one author affiliation in India, tagged with the OpenAlex topics Quantum Computing Algorithms and Architecture (T10682), Quantum Information and Cryptography (T10020) or Quantum Mechanics and Applications (T10622). Works whose title or abstract does not name quantum, qubit, entanglement or QKD are dropped, and duplicates by DOI or title are removed. The company and publication files are rebuilt when the registry refresh runs.

The researcher list is built from OpenAlex author records. An author is kept when, over the last five years, the Indian institution with the most affiliation years has more of them than any institution outside India; at least five works and a tenth of all works fall in the quantum topics above; and at least three works in those topics from the same five years list the author at an Indian institution. A short exclusion list removes authors whom OpenAlex attributes to Indian institutions in error. The list is not checked person by person.

JSON API and downloads

The registry is served as static JSON files and through a small read-only API. No key is needed.

Endpoints

GET /api/registry

Index of the datasets listed below, with file paths, origins and licences.

GET /api/registry?d=<id>

One dataset as JSON, using an id from the table below. An unknown id returns HTTP 400 with the list of ids. Responses from /api/registry can be read from any website (CORS) and carry a 10-minute cache header.

GET /api/registry/search?q=<text>&topK=<1-20>
POST /api/registry/search with body {"q": "...", "topK": 8}

Searches the company rows by name, legal name, CIN (in full or its opening characters), city, state, category, subdomain, web domain, founders and description. Every word of the query has to match; exact names and whole words score higher. Common spellings such as Bangalore and Bengaluru are treated as the same place. A semantic fallback over published registry records is not enabled for the site at present, so a query that matches no company returns an empty result list and the semantic field of the response reads "off". Limits: q up to 200 characters, topK a whole number from 1 to 20 (default 8), and about 30 requests a minute from one address. Errors are JSON with HTTP 400 for invalid input, 429 over the rate limit and 503 when search is unavailable. Results are cached for 5 minutes.

/quantum-india/data/<file>.json

The same files for direct download, linked in the table below. For requests from another website, use the /api/registry paths.

curl "https://rslquantum.com/api/registry?d=companies"
curl "https://rslquantum.com/api/registry/search?q=bengaluru&topK=5"

A search response has this shape:

{
  "q": "bengaluru",
  "topK": 5,
  "count": 1,
  "semantic": "off",
  "results": [
    {
      "kind": "company",
      "title": "QpiAI",
      "url": "/quantum-india/companies?q=qpiai",
      "snippet": "...",
      "score": 10,
      "city": "Bengaluru",
      "state": "Karnataka",
      "category": "hardware",
      "subdomain": "superconducting"
    }
  ]
}

Datasets

Licence

Fields curated by RSL Quantum are released under CC BY 4.0: the company rows, the journal list, and the curated patent and funding-round files. Please credit "Quantum India registry, RSL Quantum". Records from third parties keep the terms of their source, as listed in the table: OpenAlex metadata is CC0, EPO records follow the EPO terms of use, arXiv and Crossref records follow those services' terms and the rights of the publishers, GitHub and IBM data follow those platforms' terms, and data.gov.in references follow the Government of India open data licence.