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 started as a Qiskit project
The OpenQASM Technical Steering Committee has called an election opening 2024-12-15 and ending 2025-01-15. The electors will be directed to an online election platform for their votes. At this time, all three (3) members with expiring terms have indicated they are candidates for re-election. An Issue is open in the OpenQASM Github repository soliciting further candidates
We are searching for candidates for the role of TSC Secretary. The TSC will select a new Secretary during a TSC meeting in April, 2025. Candidates should familiarize themselves with the responsibilties of the role. If you are interested in presenting yourself as a candidate, please contact Jack Woehr, the current Secretary, at [email protected] before April, 2025.
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Live language specification version 3.1
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The branch of this repository for the previous version: OpenQASM 2.0
In this repository, you'll find all the documentation related to OpenQASM, some useful OpenQASM examples, and a reference grammar.
The live language documentation specification.
An example of OpenQASM 3.0 source code is given below. Several more examples may be found in the examples folder.
/*
* 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
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].
- [Previous Version: 2.0] Andrew W. Cross, Lev S. Bishop, John A. Smolin, Jay M. Gambetta "Open Quantum Assembly Language" [arXiv:1707.03429].
The OpenQASM project has a process for accepting changes to the language and making decisions codified in its governance model.
This project is licensed under the Apache License 2.0 - see the LICENSE file for details.
If you'd like to help please take a look to our contribution guidelines. This project adheres to a Code of Conduct. By participating, you are expected to uphold this code.
See the section on Release Notes contribution guidelines.
