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Creating quantum circuit diagrams in TikZ

Project description

⟨q\|pic⟩: Quantum circuits made easy

.. image:: docs/images/qpic.png

A compiler from quantum circuits to graphical representations.

.. image::

.. image::

.. TODO: Publish badge after porting to ReadTheDocs
.. image::
:alt: Documentation Status

- Free software: GNU GPLv3 license
- Documentation: `⟨q\|pic⟩ manual <doc/qpic_doc.pdf>`_


The ⟨q\|pic⟩ language provides a concise, readable, ASCII format for
describing quantum circuits. ``qpic`` converts ⟨q\|pic⟩ files to the
scientific paper standard of LaTeX using TikZ graphic commands.

- Automatic placement of circuit components.
- Human readable.
- Input ⟨q\|pic⟩ syntax can be produced by other scripts.
- Can be included in LaTeX documents in TikZ or PDF form.

⟨q\|pic⟩ produces high quality graphics quickly. The following graphic
illustrating part of a ripple carry adder

.. image:: docs/images/Adder_CDKM_MAJ.png

is compiled from the ⟨q\|pic⟩ code


a W a a\oplus{c}
b W b b\oplus{c}
c W c \mbox{MAJ}(a,b,c)

a b c G \rotatebox{90}{MAJ}
+b c
+a c
a b +c


Basic quantum teleportation circuit

.. image:: docs/images/BasicTeleportation.png

This classic diagram derives from the following code:


a W |\psi\rangle
b c W |\beta_{00}\rangle<
c W |\psi\rangle
a +b
a H
a b M
c X b:owire
c Z a:owire

Decorated quantum teleportation circuit

⟨q\|pic⟩ has additional features for commenting or highlighting parts of
a circuit.

.. image:: docs/images/QuantumTeleportation.png

This diagram derives from the following:


PREAMBLE \providecommand{\K}[1]{\left|#1\right\rangle} # Define ket command
a W \K{\phi} [x]
x1 W type=o # Empty wire used for positioning
x0 W style=dashed # Dividing line
x2 W type=o # Empty wire used for positioning
b0 W \K{0} [y]
b1 W \K{0} \K{\phi}

b1 H % $\K{\phi}\K{0}(\K{0}{+}\K{1})$
+b0 b1 % $(\alpha\K{0}{+}\beta\K{1})(\K{00}{+}\K{11})$
+b0 a %$\scriptstyle\alpha\K{0}(\K{00}{+}\K{11}){+}\beta\K{1}(\K{10}{+}\K{01})$
a H % $\sum_{x,y}\K{xy}(\alpha\K{y}{+}(-1)^x\beta\K{\bar{y}})$
a b0 M % $[xy](\alpha\K{y}{+}(-1)^x\beta\K{\bar{y}})$
x1 x2 a b0 PERMUTE
+b1 b0 % $[xy](\alpha\K{0}{+}(-1)^x\beta\K{1})$
b1 a % $[xy](\alpha\K{0}{+}\beta\K{1})$

# Colored boxes
b0 b1 x1 x2 @ 0 2 fill=green style=rounded_corners %% $[qq]$ Quantum entanglement
a b0 x2 x1 @ 6 6 fill=blue style=rounded_corners %% \hspace{.5cm}$2[c\rightarrow c]$ Classical channel

For an explanation of ``qpic`` commands and more examples, see the
`official documentation <doc/qpic_doc.pdf>`_.


Recommended installation method is
`pip <>`_. Current
versions of Python 2 and 3 include pip. For older versions, use `pip
installation instructions <>`_.

``pip install qpic``

If you do not have permission to install or wish to install ``qpic`` as
a single user, add ``$HOME/.local/bin`` to your ``$PATH`` and install

``pip install --user qpic``


To uninstall ``qpic`` simply type

``pip uninstall qpic``

Stand alone script

To try out the basic script without installation:

1. Download the file ````. (located in the ``qpic`` directory)
2. Run ``python your_file.qpic > your_file.tex``.

Running ⟨q\|pic⟩

``qpic`` generates TikZ code by default. ``qpic`` can also generate pdf
files using ``pdflatex`` and png files using ``convert`` (from

Create TikZ file ``diagram.tikz``

``qpic -f tikz diagram.qpic``

Create PDF file ``diagram.pdf``

``qpic -f pdf diagram.qpic``

Create PNG file ``diagram.png``

``qpic -f png diagram.qpic``

Using ⟨q\|pic⟩ with LaTeX

Including graphics in LaTeX documents

There are two main methods for including ⟨q\|pic⟩ in LaTeX documents.
Each has its advantage in certain areas. They are:

- Include TikZ code directly
- Include as a PDF graphic


``qpic my_graphic.qpic`` produces a TikZ file named ``my_graphic.tikz``,
which can be directly included into a normal LaTeX document. You will
need to add



to the preamble of your paper. Graphics can then be included with the



In some cases, additional TeX commands may be required in the preamble.
(These will be in the ``.tikz`` file preceded by ``%!``.) See the full
⟨q\|pic⟩ documentation for when additional packages are required.


``qpic -f pdf my_graphic.qpic`` will produce a PDF file named
``my_graphic.pdf``. This graphic can be viewed directly with a PDF
viewer. To insert the graphic into a LaTeX document, add the following
line to the preamble:



and include the file using the command:



This method requires the document to be processed with pdfLaTeX. For
further information see the full `⟨q\|pic⟩ documentation <doc/qpic_doc.pdf>`_.


1.0.2 (2016-04-20)

* Fix Python3 unicode bug.

1.0.1 (2016-03-18)

* Convert README to ReStructuredText for PyPi.

1.0.0 (2016-03-09)

* First release on PyPI.

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