Qphox

QphoX is a Delft, Netherlands-based quantum technology company founded in 2021 and spun out of Delft University of Technology (TU Delft). It develops quantum networking hardware to tackle the scaling challenges of quantum computing, centered on its Quantum Transducer, described as the first quantum interface between single optical and single microwave photons, enabling optical interconnects between superconducting quantum processors. Alongside the transducer, QphoX offers an Optical Control System for delivering RF signals into extreme cryogenic environments and a CryoSwitch Control Module for use with Radiall's cryogenic latching actuator. The company publishes open-source Python instrument-control libraries (QCoDeS drivers) on GitHub for operating its hardware. QphoX is backed by Speedinvest. QphoX exposes no public web API or developer portal.

Qphox is profiled on the APIs.io network. Tagged areas include Company, Quantum Computing, Quantum Networking, Hardware, and Photonics.

Qphox’s developer surface includes engineering blog and 4 more developer resources.

🌐 Visit website 📡 Source on GitHub

5.3/100 minimal ▬ flat Agent 0/100 human only library Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

Company Quantum Computing Quantum Networking Hardware PhotonicsCryogenicsDeep TechInstrument Control

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 5.3/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 0.0 / 20

Access Clarity 0.0 / 20

Operational Transparency 0.3 / 13

Contract Governance 0.0 / 12

Discoverability 5.0 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

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Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Qphox Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: qphox
deliveryModel:
  model: library
  open_source: false
  commercial: false
  callable_host: false
  label: Library · distributed through package registries, no callable service
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/qphox.png
name: Qphox
description: QphoX is a Delft, Netherlands-based quantum technology company founded in 2021 and spun out of Delft University
  of Technology (TU Delft). It develops quantum networking hardware to tackle the scaling challenges of quantum computing,
  centered on its Quantum Transducer, described as the first quantum interface between single optical and single microwave
  photons, enabling optical interconnects between superconducting quantum processors. Alongside the transducer, QphoX offers
  an Optical Control System for delivering RF signals into extreme cryogenic environments and a CryoSwitch Control Module
  for use with Radiall's cryogenic latching actuator. The company publishes open-source Python instrument-control libraries
  (QCoDeS drivers) on GitHub for operating its hardware. QphoX is backed by Speedinvest. QphoX exposes no public web API or
  developer portal.
url: https://raw.githubusercontent.com/api-evangelist/qphox/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- speedinvest
x-tier: profiled
x-tier-reason: hardware-company-no-api
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Quantum Computing
- Quantum Networking
- Hardware
- Photonics
- Cryogenics
- Deep Tech
- Instrument Control
apis: []
common:
- type: DomainSecurity
  url: security/qphox-domain-security.yml
- type: Website
  url: https://www.qphox.eu
- type: GitHubOrganization
  url: https://github.com/QphoX
- type: Blog
  url: https://qphox.eu/news/
- type: Packages
  url: packages/qphox-packages.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 2
  pass: local-v1

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