qe-compiler: An MLIR-based quantum compiler for quantum engines

The qe-compiler is an MLIR-based compiler with support for OpenQASM 3. The compiler is designed to compile quantum programs to quantum hardware as part of the overall Quantum Engine execution workflow. The Quantum Engine is a system comprised of low-level software components enabling the execution of quantum programs in quantum hardware.

This repo contains the compiler front-end to convert OpenQASM 3 source files into a collection of four MLIR dialects called QUIR (QUantum Intermediate Representation), OQ3 (OpenQASM 3), Pulse (OpenPulse), and QCS (Quantum Computing System). This set of dialects allows OpenQASM programs to be converted into a form suitable to manipulate with LLVM. This repo also contains tools and compiler passes that are agnostic of details of any control system vendor. For instance, it contains localization passes to split source programs into the qubit or channel-specific groupings required by a target quantum control system.

This repo does not contain a complete compiler. Rather, it is a framework for building compilers. To produce a complete compiler, one needs to implement a qe-compiler target. This repo comes with a "mock" target to assist developers in understanding how to develop such targets.

Contents

• qe-compiler: An MLIR-based quantum compiler for quantum engines
  • Contents
  • Notice
  • Building
    • Python library
    • Platforms
      • Windows
    • Static Code Checks
  • Example Use
  • Contribution Guidelines
    • CI and Release Cycle
  • License

Notice

We are in the process of changing the name of this project from qss-compiler to qe-compiler. At present, only the repository name and this README have been updated.

This open-source version of the qe-compiler is currently lacking documentation. We will add getting started guides and other resources in the near future.

Building

We use Conan to build the compiler and handle dependencies.

To build:

1. git clone git@github.com:Qiskit/qe-compiler.git && cd qe-compiler
2. Install Python dependencies: pip install -r requirements-dev.txt
3. Export local Conan recipe dependencies to Conan: ./conan_deps.sh
4. mkdir build && cd build
5. Install Conan dependencies: conan install .. --build=outdated -pr:h default -pr:b default
6. Invoke the build with Conan: conan build ... This will build the compiler.
7. To run tests: conan build .. --test

Alternatively instead of steps 6/7, you can build directly with CMake (also from within the build folder):

1. Configure - cmake -G Ninja -DCMAKE_TOOLCHAIN_FILE=conan_toolchain.cmake -DCMAKE_BUILD_TYPE="Release" ..
2. Build - ninja
3. Check tests - ninja check-tests

Python library

The qss-compiler Python library will be installed by default to the resolved environment Python when installing with conan. To disable add the option conan build .. -o pythonlib=False.

Platforms

Windows

Building and running the compiler is supported with WSL.

Static Code Checks

The easiest, fastest, and most automated way to integrate the formatting into your workflow is via pre-commit. Note that this tool requires an internet connection to initially setup because the formatting tools needs to be downloaded. These should be installed and setup prior to any development work so that they are not forgotten about.

The setup is straight forward:

pip install pre-commit
pre-commit install

For more details on usage see the contribution guide.

Example Use

You can inspect the options available when invoking the qe-compiler by passing the -h flag. There are many options. A basic invocation that will work without implementing a target will convert an OpenQASM source file, example.qasm to the MLIR dialect set described above with: qss-compiler --emit=mlir example.qasm

Contribution Guidelines

If you'd like to contribute to the qe-compiler, please take a look at our contribution guidelines.

CI and Release Cycle

Please find this information in our contribution guidelines.

License

The qe-compiler is licensed under the Apache License v2 with LLVM Exceptions.