Hello! I’m using the qml.draw_mpl() to draw diagrams of my quantum circuits, and I want to customize the texts written in the quantum gates in the diagrams. For example, the following code will generate a diagram with one quantum gate with text ‘RX’: dev=qml.device('lightning.qubit', wires=1) @qml…

Hi @Tz_19 , If your purpose is simply to draw the circuit then you don’t even need a qnode. In the docs for the MPLDrawer class you can see some examples of “box_gate” with custom labels. You can even make the gate larger than the others as shown in the last example there. Let me know if this ans…

Hi @CatalinaAlbornoz , thank you for pointing the simple way to draw circuits! However, I still encounter some problems when using the MPLDrawer. For illustration, the following code generates a strange diagram: import pennylane as qml from matplotlib import pyplot as plt def draw_attention_module…

Hi @Tz_19 , Thanks for bringing this up, it looks like there’s a bug in the use of styles. Fortunately there’s an easy workaround. Instead of using use_style you can call the style directly: qml.drawer.style._black_white(). You can use other styles too by just using style and adding an underscore b…

Thank you so much! My problems have been solved completely with your help. Thanks a lot for your patient answering.

Hello! I have an additional question. Can I write texts on the right of the circuit to denote the output state when using the MPLDrawer? I find that I can use drawer.label() to put texts on the left to denote the input state, but I don’t know how to put texts on right.

Hi @Tz_19 , You can use drawer.measure() . This has a text keyword argument. text=None (str) – an annotation for the lower right corner. Let me know if this is what you were looking for!

Hi @Tz_19 , You can take the figure and axes from the drawer and use them with Matplotlib methods such as annotate. Here’s an example: import pennylane as qml from matplotlib import pyplot as plt def draw_attention_module(): drawer=qml.drawer.MPLDrawer(2, {i: i for i in range(2)}) drawer.…

How to customize the text in the quantum gates when drawing a quantum circuit diagram?

PennyLane Help

Tz_19 August 22, 2025, 3:29pm 8

I mean, add text at the right of the wires, like in the red square of the graph below.

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How to customize the text in the quantum gates when drawing a quantum circuit diagram?

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