# Google Quantum AI

**Canonical:** https://apis.io/providers/google-quantum-ai/  
**Website:** https://quantumai.google/  
**APIs profiled:** 15

Google Quantum AI is Google's quantum-computing research and engineering arm, building superconducting quantum processors (most recently the Willow chip with below-threshold quantum error correction) and the open software stack that runs on them. The team operates the Quantum Computing Service via the Quantum Engine API (quantum.googleapis.com, v1alpha1), accessed primarily through the cirq-google Python client. Google Quantum AI also stewards a portfolio of Apache 2.0 open-source quantum software — Cirq, qsim, OpenFermion, Stim, Qualtran, TensorFlow Quantum, ReCirq, Tesseract, and Unitary — published under the quantumlib GitHub organisation, plus the Willow Early Access Program for sponsored researcher access to current hardware.

## Kin Score — 58.6 / 100 (strong)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 58.6).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 68.5 |
| Governance | 9.8 |
| Contract Governance | 9.8 |
| Operational Transparency | 36.8 |
| Developer Ergonomics | 71.4 |
| Commercial Clarity | 73.7 |
| Access Clarity | 73.7 |

## Agent readiness — 32.6 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | documented |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | documented |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Free · Self-serve signup — onboarding: self-serve, pricing: free, trial: no (confidence: high).

## APIs (15)

- **Cirq** — Cirq is an Apache 2.0 Python framework for designing, manipulating, simulating, and executing Noisy Intermediate-Scale Quantum (NISQ) circuits. Cirq is the canonical client libr...
- **qsim** — qsim is a high-performance C++ state-vector simulator with a Python (qsimcirq) binding that plugs directly into Cirq. It is optimised for AVX/AVX-512, CUDA, and cuQuantum backen...
- **OpenFermion** — OpenFermion is an Apache 2.0 library for translating quantum chemistry and materials science problems (electronic structure, fermionic operators, second quantisation) into quant...
- **Stim** — Stim is a fast stabilizer-circuit simulator and detector-error-model toolchain that underpins Google Quantum AI's quantum error-correction work, including the Willow surface-cod...
- **Qualtran** — Qualtran provides abstractions (Bloqs) for expressing, decomposing, and resource-estimating fault-tolerant quantum algorithms. It is Google Quantum AI's framework for reasoning ...
- **TensorFlow Quantum** — TensorFlow Quantum (TFQ) is a hybrid quantum-classical machine learning library that integrates Cirq circuits as differentiable layers inside TensorFlow/Keras pipelines. Maintai...
- **ReCirq** — ReCirq is a research-grade collection of reproducible Cirq experiments and applications published by Google Quantum AI, covering Fermi-Hubbard simulations, quantum chemistry ben...
- **Tesseract Decoder** — Tesseract is a search-based maximum-likelihood decoder for quantum error correction that accompanies Stim. It targets surface-code and color-code decoding workloads used in Will...
- **Unitary** — Unitary is an API library for adding quantum behaviours (superposition, entanglement, measurement) into classical games and interactive software, used in Google Quantum AI's edu...
- **Google Quantum AI Calibrations API** — Periodic device performance snapshots.
- **Google Quantum AI Jobs API** — Executions of a program against a processor or simulator backend.
- **Google Quantum AI Processors API** — Quantum processing units (Willow, Sycamore-class) available to the project.
- **Google Quantum AI Programs API** — Hardware-compatible circuits uploaded to a Google Cloud project.
- **Google Quantum AI Reservations API** — Processor time-slot reservations and budgets.
- **Google Quantum AI Results API** — Measurement results returned by completed jobs.

## Agentic access (1)

- **Google Quantum Ai Agentic Access** — 27 operations · 12 acting

## Security (2)

- **Google Quantum Ai Authentication** — oauth2 · 1 scheme
- **Google Quantum Ai Domain Security** — TLSv1.3 · HSTS · DMARC

## Plans (1)

- **Google Quantum Ai Plans Pricing**

## Tags

Quantum Computing, Quantum, Hardware, NISQ, Error Correction, Willow, Sycamore, Cirq, Quantum Engine, Superconducting Qubits, Google Cloud

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/google-quantum-ai/). Scores are computed from the provider's own public artifacts under a published rubric.