# Importing and exporting quantum circuits and ZX-diagrams¶

There are several ways to import and export circuits and ZX-diagrams in PyZX.

## Importing and exporting quantum circuits¶

There are a number of standards for representing quantum circuits that are supported in PyZX. To see if PyZX supports a certain file format, just call `load`

:

```
circuit = zx.Circuit.load("path/to/circuit.extension")
```

The currently supported formats are

QASM,

the ASCII format of Quipper,

the simple

*.qc*format used for representing quantum circuits in LaTex,and the qsim format used by Google.

To convert a PyZX circuit to these formats, use `to_qasm`

, `to_quipper`

, `to_qc`

.

PyZX also offers a convenience function to construct a circuit out of a string containing QASM code using either `from_qasm`

or `qasm`

.

To convert a Circuit into a PyZX Graph (i.e. a ZX-diagram), call the method `to_graph`

.

## Importing and exporting ZX-diagrams¶

A ZX-diagram in PyZX is represented as an instance of `Graph`

. A ZX-diagram can be loaded using the `.qgraph`

format that Quantomatic uses, via `from_json`

. It can be converted into that format using `to_json`

.

Apart from this reversible representation, there are also several one-way translations for exporting ZX-diagrams from PyZX. A graph can be exported to GraphML format using `to_graphml`

.
To export a ZX-diagram to tikz for easy importing to Latex, use `to_tikz`

.

Additionally, PyZX diagrams can be directly exported into the applications Tikzit using the `tikzit`

function or edited in Quantomatic using the function `edit_graph`

.

Finally, to display a ZX-diagram in Jupyter call `draw`

and to create a matplotlib picture of the ZX-diagram use `draw_matplotlib`

.

Some ZX-diagrams can be converted into an equivalent circuit. For complicated ZX-diagrams, the function `extract_circuit`

is supplied. For ZX-diagrams that come directly from Circuits, e.g. those produced by calling `c.to_graph`

for a Circuit `c`

, one can also use the static method `from_graph`

, which is more lightweight.