"Diagram" gives extra text line above the diagram

Questions
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1

The attached five lines code gives such a circuit diagram which contains some extra text lines above the diagram. Probably it describes the circuit but I would like to have only nice figure of the circuit. How can I get rid of this extra text line?

Open in Wolfram Cloud ↗
2

These are the automatic subcircuit labels for Multiplexers. You can either assign some better labels to them as a second argument:

mplexerz1 = 
 QuantumCircuitOperator[{"Multiplexer", "RZ"[a1], "RZ"[a2], "RZ"[a3], 
   "RZ"[a4]}, "Multiplexer"]

Or specify an option for subcircuits not to show any label:

mot["Diagram", "SubcircuitOptions" -> "ShowLabel" -> False]
3

Thanks for the answer to my previous question. “SubcircuitOptions” → “ShowLabel” → False removes the text message above the diagram.

I attach a pdf file which shows a quantum circuit created by the command

op["Diagram","SubcircuitOptions" -> "ShowLabel" -> False]

I do not understand why a simple multiple controlled “X” gates are not displayed
The operator op is created by a longer code.

diagram.pdf (24.4 KB)

4

I think the problem presented in the pdf file is different from previos question. Please create a separate post for this question.

5

By default, only the first level of sub-circuits is shown; you can either flatten your operator with op[“Flatten”] (or flatten just a few of them up to some given level op[“Flatten”, level]) or increase the level like this op[“Diagram”, “SubcircuitLevel” → 2].

6

Thank you. It works perfectly