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qsim

Fast C++ and Python library for state-vector simulation of quantum circuits.

by quantumlib · GitHub
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algorithmsapicirqApache-2.0C++
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In plain words

Simulate quantum circuits to study how quantum states change over time using a high-performance library.

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678677
2026-07-202026-08-31
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📄 About

Fast C++ and Python library for state-vector simulation of quantum circuits.

qsim has 677 stars on GitHub. It has been forked 207 times. qsim is written mainly in C++. It has been in active development since 2020. qsim is available under the Apache-2.0 license. Its main topics are algorithms, api, cirq, cpp.

Frequently asked questions

What is qsim?

Fast C++ and Python library for state-vector simulation of quantum circuits.

Is qsim open source?

qsim is an open-source project. It is released under the Apache-2.0 license.

Is qsim free?

Yes. qsim is free and open source — you can use, modify and self-host it.

What license does qsim use?

qsim is available under the Apache-2.0 license.

What language is qsim written in?

qsim is written mainly in C++.

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