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https://github.com/openqasm/openqasm

Quantum assembly language for extended quantum circuits
https://github.com/openqasm/openqasm

openqasm quantum-computing quantum-information

Last synced: 4 months ago
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Quantum assembly language for extended quantum circuits

Host: GitHub
URL: https://github.com/openqasm/openqasm
Owner: openqasm
License: apache-2.0
Created: 2017-03-03T17:03:30.000Z (over 7 years ago)
Default Branch: main
Last Pushed: 2023-12-18T09:41:40.000Z (6 months ago)
Last Synced: 2023-12-18T10:55:51.683Z (6 months ago)
Topics: openqasm, quantum-computing, quantum-information
Language: Python
Homepage: https://openqasm.com
Size: 11.4 MB
Stars: 1,093
Watchers: 80
Forks: 319
Open Issues: 92
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
- Governance: governance.md

Lists

awesome-quantum-software - OpenQASM - Open-source quantum assembly language. (Quantum assembly)
awesome-stars - openqasm
quantum-awesome - https://github.com/openqasm/openqasm
awesome-stars - openqasm/openqasm - Quantum assembly language for extended quantum circuits (Python)
awesome-stars - openqasm
awesome-qiskit - OpenQASM - Openqasm is an imperative programming language designed for near-term quantum computing algorithms and applications. quantum programs are described using the measurement-based quantum circuit model with support for classical feed-forward flow control based on measurement outcomes. (Main)

README

        # OpenQASM

OpenQASM is an imperative programming language for describing quantum circuits. It is capable of

describing universal quantum computing using the circuit model, measurement-based model,

and near-term quantum computing experiments.

This repo contains the OpenQASM specification, examples, and tools for the OpenQASM intermediate representation.

OpenQASM is a [Qiskit project](https://qiskit.org).

## Current version: **3.0**

* Live language specification [**version 3.0**](https://openqasm.github.io/)

* The branch of this repository for the previous version: [OpenQASM 2.0](https://github.com/openqasm/openqasm/tree/OpenQASM2.x)

## About this project

In this repository, you'll find all the documentation related to OpenQASM, some useful OpenQASM examples, and [plugins for some text editors](#plugins).

### Language specs

The live [language documentation](https://openqasm.github.io/) specification.

### Examples

An example of OpenQASM 3.0 source code is given below. Several more examples may be found in the [examples folder](examples).

```text

/*

 * Repeat-until-success circuit for Rz(theta),

 * cos(theta-pi)=3/5, from Nielsen and Chuang, Chapter 4.

 */

OPENQASM 3;

include "stdgates.inc";

/*

 * Applies identity if out is 01, 10, or 11 and a Z-rotation by

 * theta + pi where cos(theta)=3/5 if out is 00.

 * The 00 outcome occurs with probability 5/8.

 */

def segment qubit[2] anc, qubit psi -> bit[2] {

  bit[2] b;

  reset anc;

  h anc;

  ccx anc[0], anc[1], psi;

  s psi;

  ccx anc[0], anc[1], psi;

  z psi;

  h anc;

  measure anc -> b;

  return b;

}

qubit input;

qubit[2] ancilla;

bit[2] flags = "11";

bit output;

reset input;

h input;

// braces are optional in this case

while(int(flags) != 0) {

  flags = segment ancilla, input;

}

rz(pi - arccos(3 / 5)) input;

h input;

output = measure input;  // should get zero

```

## Citation format

For research papers, we encourage authors to reference.

- [Version 3.0] Andrew W. Cross, Ali Javadi-Abhari, Thomas Alexander, Niel de Beaudrap, Lev S. Bishop, Steven Heidel, Colm A. Ryan, John Smolin, Jay M. Gambetta, Blake R. Johnson "OpenQASM 3: A broader and deeper quantum assembly language" [[arxiv:2104.14722]](https://arxiv.org/abs/2104.14722).

- [Previous Version: 2.0] Andrew W. Cross, Lev S. Bishop, John A. Smolin, Jay M. Gambetta "Open Quantum Assembly Language" [[arXiv:1707.03429]](https://arxiv.org/abs/1707.03429).

## Governance

The OpenQASM project has a process for accepting changes to the language and making decisions codified in its [governance model](governance.md).

## License

This project is licensed under the Apache License 2.0 - see the [LICENSE](./LICENSE) file for details.

## Contributing

If you'd like to help please take a look to our [contribution guidelines](CONTRIBUTING.md). This project adheres to a [Code of Conduct](./CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code.

## Release Notes

See the section on Release Notes [contribution guidelines](CONTRIBUTING.md#release-notes).