qml.tape.expand_tape_state_prep

expand_tape_state_prep(tape, skip_first=True)

Expand all instances of StatePrepBase operations in the tape.

Parameters

• tape (QuantumScript) – The tape to expand.

• skip_first (bool) – If True, will not expand a StatePrepBase operation if it is the first operation in the tape.

Returns

The expanded version of tape.

Return type

QuantumTape

Example

If a StatePrepBase occurs as the first operation of a tape, the operation will not be expanded:

>>> ops = [qml.StatePrep([0, 1], wires=0), qml.Z(1), qml.StatePrep([1, 0], wires=0)]
>>> tape = qml.tape.QuantumScript(ops, [])
>>> new_tape = qml.tape.tape.expand_tape_state_prep(tape)
>>> new_tape.operations
[StatePrep(array([0, 1]), wires=[0]), Z(1), MottonenStatePreparation(array([1, 0]), wires=[0])]

To force expansion, the keyword argument skip_first can be set to False:

>>> new_tape = qml.tape.tape.expand_tape_state_prep(tape, skip_first=False)
[MottonenStatePreparation(array([0, 1]), wires=[0]), Z(1), MottonenStatePreparation(array([1, 0]), wires=[0])]

code/api/pennylane.tape.expand_tape_state_prep

 

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