qml.marker¶

marker(tape, level)[source]¶

Mark a location in a transform program for easy access with inspectability.

Parameters:

tape (QuantumScript | QNode | CompilePipeline) – the object we want to dispatch the transform onto
level (str) – the label for the level.

Note

Invalid level names in marker are "top", "user", "device", and "gradient", "all", and "all-mlir", which are internally protected.

@qml.marker(level="rotations-merged")
@qml.transforms.merge_rotations
@qml.marker(level="my_level")
@qml.transforms.cancel_inverses
@qml.qnode(qml.device('null.qubit'))
def c():
    qml.RX(0.2,0)
    qml.X(0)
    qml.X(0)
    qml.RX(0.2, 0)
    return qml.state()

>>> print(qml.draw(c, level="my_level")())
0: ──RX(0.20)──RX(0.20)─┤  State
>>> qml.specs(c, level="my_level")()['resources'].gate_types
{'RX': 2}
>>> print(qml.draw(c, level="rotations-merged")())
0: ──RX(0.40)─┤  State

code/api/pennylane.marker

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qml.marker¶

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