g2q - Guile to QASM compiler.

Overview:

A very simple Guile-to-OpenQASM 2.0 compiler based on a GNU Guile addon library that lets you write programs for QASM-based quantum computers using Scheme.

Dependencies:

• GNU Guile - v3.0.0 or later ( https://www.gnu.org/software/guile/ )

• grsp - v1.1.7 or later ( https://github.com/PESchoenberg/grsp.git )

Optional:

• qre - https://github.com/PESchoenberg/qre if you want to run some of the examples on a couple of quantum simulators on your computer.

Installation:

• Once you have all dependencies installed on your system, get g2q, unpack it into a folder of your choice and cd into it.

• g2q installs as a GNU Guile library. See GNU Guile’s manual instructions for details concerning your OS and distribution, but as an example, on Ubuntu you would issue (depending on where you installed Guile):

  sudo mkdir /usr/share/guile/site/2.2/g2q
  
  or
  
  sudo mkdir /usr/local/share/guile/site/2.2/g2q
  
  and then 
  
  sudo cp *.scm -rv /usr/share/guile/site/2.2/g2q
  
  or
  
  sudo cp *.scm -rv /usr/local/share/guile/site/2.2/g2q
  

and that will do the trick.

Uninstall:

• You just need to remove

/usr/share/guile/site/2.2/g2q

or

/usr/local/share/guile/site/2.2/g2q

and its subfolders.

• There are no other dependencies.

Usage:

• Should be used as any other GNU Guile library; programs written with g2q should be written and compiled as any regular Guile program.

• See the examples contained in the /examples folder. These are self-explaining and filled with comments. You will find there both .scm and .qasm files. Some programs can run as they are, and some will require program qre.

• As a general guide, in order to compile a g2q-based program - say example1.scm:

  • cd into the folder containing the program.

  • enter

    guile example1.scm

    to run it just as any regular GNU Guile program.

• If your code is correct, this will generate a full QASM file named example1.qasm on the same folder. You can then try that code on a quantum computer simulator or even a real one that is compatible with Open QASM 2.0.

• File example6.scm and other with a higher prder number (example7, example8, etc.) require that you have qre installed on your system (see below); this particular example as well as many of the others described above not only compile code into QASM2 but actually runs it using qre.

Credits and Sources:

• GNU contributors (2019). GNU’s programming and extension language — GNU Guile. [online] Gnu.org. Available at: https://www.gnu.org/software/guile/ [Accessed 2 Sep. 2019].

• Edronkin, P. (2019). qre - local and remote runtime for QASM2 programs. [online] qre. Available at: https://peschoenberg.github.io/qre/ [Accessed 26 Aug. 2019].

• Edronkin, P. (2019). grsp - Useful Scheme functions. [online] grsp. Available at: https://peschoenberg.github.io/grsp/ [Accessed 26 Aug. 2019].

• URL of this project - https://github.com/PESchoenberg/g2q .

Please let me know if I forgot to add any credits or sources.

Related reading material:

• P. Maymin (1996). Extending the Lambda Calculus to Express Randomized and Quantumized Algorithms [online]. Available at: https://arxiv.org/abs/quant-ph/9612052 [Accessed 02 Sep. 2019]

• van Tonder, A. (2003). A lambda calculus for quantum computation. [online] Het.brown.edu. Available at: http://www.het.brown.edu/people/andre/qlambda/ [Accessed 2 Sep. 2019].

• Selinger, P. and Valiron, B. (2012). Quantum Lambda Calculus. [ebook] Available at: https://www.mscs.dal.ca/~selinger/papers/qlambdabook.pdf [Accessed 2 Sep. 2019].

• Selinger, P. and Valiron, B. (2005). A lambda calculus for quantum computation with classical control. [ebook] Available at: https://www.mathstat.dal.ca/~selinger/papers/papers/qlambda-mscs.pdf [Accessed 2 Sep. 2019].

License:

• LGPL-3.0-or-later.