OpenQL Framework

OpenQL is a framework for high-level quantum programming in C++/Python. The framework provides a compiler for compiling and optimizing quantum code. The compiler produces the intermediate quantum assembly language and the compiled micro-code for various target platforms. While the microcode is platform-specific, the quantum assembly code (qasm) is hardware-agnostic and can be simulated on the QX simulator.

Supported Patforms

• Linux
• Windows
• OSX

Required Packages

The following packges are required if you are not using pre-built conda packages:

• g++ compiler with C++11 support (Linux)
• MSVC 2015 with update 3 or above (Windows)
• cmake (>= 3.0)
• swig
• python (>= 3.5)
• [Optional] pytest used for running tests
• [Optional] Graphviz Dot utility to convert graphs from dot to pdf, png etc
• [Optional] XDot to visualize generated graphs in dot format

In all the instructions below, python refers to Python 3 and pip refers to Pip 3.

Notes for Windows Users

• Use Power Shell for installation

• Set execution policy by:

    Set-ExecutionPolicy -ExecutionPolicy RemoteSigned
  

• Install PowerShell Community Extensions

• MSVC 2015 should be added to the path by using the following command:

    Invoke-BatchFile "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" amd64
  

• To make your life easier, you can add this command to the profile you are using for power shell, avoiding the need to manually run this command every time you open a power shell. You can see the path of profile by echo $PROFILE. Create/Edit this fille to add the above command.

• Python.exe and swig.exe should be in the path of power shell. To test if swig.exe is the path, run:

    Get-Command swig
  

• Make sure the following variables are defined:

  • PYTHON_INCLUDE (should point to the directory containing Python.h)
  • PYTHON_LIB (should point to the python library python35.lib)

Installing OpenQL as a Conda Package

use pre-built packages

Openql can be installed as a conda package (currently on Linux and Windows) by:

conda install -c imran.ashraf openql 

use recipe to build package locally

conda packages can also be built locally by using the recipie available in conda-recipe directory, by running the following command:

conda build conda-recipe/.

The generated package can then be installed by:

conda install openql --use-local

Installing OpenQL as Python Package

N.B. the instructions below will compile the C++ files the first time you try to install OpenQL package. If you are updating an existing installation you should first clean and recompile the C++ files using the following command.

python cleanme.py

Linux, Windows & OSX

Running the following command in Terminal/Power Shell should install the openql package:

python setup.py install  --user

Or

pip install  -e .

By defining NPROCS=N environment variable, multiple processos can be created for faster compilation. For example, the following command will create 4 processes for compilation:

NPROCS=4 python setup.py install  --user

Running the tests

In order to pass all the tests, qisa-as and libqasm should be installed first. Follow qisa-as and libqasm instructions to install python interfaces of these modules. Once qisa-as and libqasm are installed, you can run all the tests by:

py.test -v

Or

python -m pytest

Compiling C++ OpenQL tests and examples

Existing tests and examples can be compiled by the following instructions. You can use an existing example as a starting point and write your own programs. Make sure to include them in CMakeLists.txt file to inform cmake to compile it as well.

Linux/OSX

mkdir cbuild
cd cbuild 
cmake ..   # generates the make file based on CMakeLists.txt in the OpenQL directory
make       # compiles the source code into the current directory. 

To execute an example program go to e.g., OpenQL/cbuild/examples and execute one of the files e.g., ./simple. The output will be saved to the output directory next to the file.

If one wants to compile and run a single file, e.g., example.cc, to compile it one can run :

mkdir output           # create an output directory if it does not exist
g++ -std=c++11 example.cc -o example.exe -I OpenQL/   # compile the file
./example.exe                                         # execute the file

Windows

mkdir cbuild
cd cbuild
cmake -G "NMake Makefiles" ..
nmake

Usage

<<<<<<< HEAD Example C++ tests and examples can be found in 'tests' and 'examples' directories. Executables for these will be generated in 'build/tests' and 'build/examples' directory.

Example python tests and examples can be found in the 'tests' and 'examples' directories.

Example C++ tests and programs can be found in 'tests' and 'examples' directories. Executables for these will be generated in 'build/tests' and 'build/examples' directory.

Example python tests and programs can be found in the 'tests' and 'examples' directories.

develop These can be executed as 'python tests/simplePyTest.py'.

Getting started

After installing OpenQL a good place to get started is by looking at the files in the "tests" directory. Here you can find commented examples on how to use OpenQL. For instance, examples/getting_started.py could be a good starting point. doc directory as well as the Wiki page documents various aspects.

N.B. gates in OpenQL are case insensitive.

Changelog

Please read CHANGELOG.md for more details.

Contributing

Please read CONTRIBUTING.md for more details. Typically you will be need to perform the following steps to contribute:

1. Fork this repository
2. Create a branch
3. Commit your changes
4. Push your commits to the branch
5. Submit a pull request

You can find more information about Pull Requests here

Contributors

Please see CONTRIBUTORS.md.