qml.drawer¶

The drawer module contains the code for generating visuals of circuits.

This module provides the circuit drawing functionality used to display circuits visually.

Functions¶

`draw`(qnode[, wire_order, show_all_wires, ...])	Create a function that draws the given qnode or quantum function.
`draw_mpl`(qnode[, wire_order, ...])	Draw a qnode with matplotlib
`tape_mpl`(tape[, wire_order, show_all_wires, ...])	Produces a matplotlib graphic from a tape.
`tape_text`(tape[, wire_order, ...])	Text based diagram for a Quantum Tape.

Classes¶

MPLDrawer(n_layers, n_wires[, c_wires, ...])

Allows easy creation of graphics representing circuits with matplotlib

Styling Matplotlib Circuit Graphics¶

The drawer module provides two functions for modifying the style of matplotlib graphics, such as those generated by qml.draw_mpl. The qml.drawer.use_style function modifies the plt.rcParams global styling variable. Any styling can be reset with qml.drawer.use_style('black_white').

`available_styles`()	Get available style specification strings.
`use_style`(style)	Set a style setting.

The following images are generated via the following code, where style is replaced by an available style specification string (e.g., "pennylane" or "solarized_light"):

@qml.qnode(qml.device('lightning.qubit', wires=(0,1,2,3)))
def circuit(x, z):
    qml.QFT(wires=(0,1,2,3))
    qml.Toffoli(wires=(0,1,2))
    qml.CSWAP(wires=(0,2,3))
    qml.RX(x, wires=0)
    qml.CRZ(z, wires=(3,0))
    return qml.expval(qml.PauliZ(0))

qml.drawer.use_style(style)
fig, ax = qml.draw_mpl(circuit)(1.2345, 1.2345)

Note that the shown pennylane style can be replicated exactly by having the Quicksand Bold font installed and refreshing the Matplotlib font cache (by deleting the fontlist file in the Matplotlib cache directory) — to find the cache directory, run matplotlib.get_cachedir(). If this font is not available, the drawer will fall back on a default font.