# qsim

**Canonical:** https://apis.io/apis/google-quantum-ai/qsim/  
**Provider:** Google Quantum AI — https://apis.io/providers/google-quantum-ai/  
**Documentation:** https://quantumai.google/qsim

qsim is one of 15 APIs that [Google Quantum AI](https://apis.io/providers/google-quantum-ai/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Quantum Computing, Simulation, Performance, and Open-Source. The published artifact set on APIs.io includes API documentation.

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 backends and is the default classical engine for benchmarking Cirq circuits at scales of 30+ qubits before submitting to hardware.

## Machine-readable artifacts (3)

- **Documentation** — https://quantumai.google/qsim
- **SourceCode** — https://github.com/quantumlib/qsim
- **PackageURL** — https://pypi.org/project/qsimcirq/

## Other Google Quantum AI APIs (12)

- [Cirq](https://apis.io/apis/google-quantum-ai/cirq/)
- [OpenFermion](https://apis.io/apis/google-quantum-ai/openfermion/)
- [Stim](https://apis.io/apis/google-quantum-ai/stim/)
- [Qualtran](https://apis.io/apis/google-quantum-ai/qualtran/)
- [TensorFlow Quantum](https://apis.io/apis/google-quantum-ai/tensorflow-quantum/)
- [ReCirq](https://apis.io/apis/google-quantum-ai/recirq/)
- [Tesseract Decoder](https://apis.io/apis/google-quantum-ai/tesseract-decoder/)
- [Unitary](https://apis.io/apis/google-quantum-ai/unitary/)
- [Google Quantum AI Calibrations API](https://apis.io/apis/google-quantum-ai/google-quantum-ai-calibrations-api/)
- [Google Quantum AI Jobs API](https://apis.io/apis/google-quantum-ai/google-quantum-ai-jobs-api/)
- [Google Quantum AI Processors API](https://apis.io/apis/google-quantum-ai/google-quantum-ai-processors-api/)
- [Google Quantum AI Programs API](https://apis.io/apis/google-quantum-ai/google-quantum-ai-programs-api/)

## Tags

Quantum Computing, Simulation, Performance, Open-Source

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/google-quantum-ai/qsim/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/google-quantum-ai/.