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Adding new feature wire_options to draw_mpl function (#6486)
**Context:** On the level of mid-scale algorithms, it might be nice to differentiate between different "types" of wires, for example by coloring them differently, or giving them distinct line styles. As an example, in PennyLaneAI/qml#1185 on preparing matrix product states, there are auxiliary bond qubits and physical qubits, and coloring them differently would be a neat thing to do. **Description of the Change:** Update the output wire_options that could change the line style and color for circuit output. ```python @qml.qnode(qml.device("default.qubit")) def node(x): for w in range(5): qml.Hadamard(w) return qml.expval(qml.PauliZ(0) @ qml.PauliY(1)) # Make all wires cyan and bold, # except for wires 2 and 6, which are dashed and another color wire_options = {"color": "cyan", "linewidth": 5, 2: {"linestyle": "--", "color": "red"}, 6: {"linestyle": "--", "color": "orange"} } _,ax = qml.draw_mpl(node, wire_options=wire_options)(0.52) ``` **Benefits:** When complicated sates and quantum circuits diagram are created, wires could be marked with different selections. **Possible Drawbacks:** N/A **Related GitHub Issues:** #6165 --------- Co-authored-by: David Wierichs <[email protected]> Co-authored-by: ringo-but-quantum <> Co-authored-by: Astral Cai <[email protected]> Co-authored-by: Christina Lee <[email protected]>
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