qml.labs.resource_estimation.ResourceSelectPauliRot

class ResourceSelectPauliRot(rotation_axis, num_ctrl_wires, precision=None, wires=None)

Bases: ResourceOperator

Resource class for the SelectPauliRot gate.

Parameters:

• rotation_axis (str) – the rotation axis used in the multiplexer

• num_ctrl_wires (int) – the number of control wires of the multiplexer

• precision (float) – the precision used in the single qubit rotations

• wires (Sequence[int], optional) – the wires the operation acts on

Resources:

The resources are obtained from the construction scheme given in Möttönen and Vartiainen (2005), Fig 7a. Specifically, the resources for an \(n\) qubit unitary are given as \(2^{n}\) instances of the CNOT gate and \(2^{n}\) instances of the single qubit rotation gate (RX, RY or RZ) depending on the rotation_axis.

See also

SelectPauliRot

Example

The resources for this operation are computed using:

>>> mltplxr = plre.ResourceSelectPauliRot(
...     rotation_axis = "Y",
...     num_ctrl_wires = 4,
...     precision = 1e-3,
... )
>>> print(plre.estimate(mltplxr, plre.StandardGateSet))
--- Resources: ---
 Total qubits: 5
 Total gates : 32
 Qubit breakdown:
  clean qubits: 0, dirty qubits: 0, algorithmic qubits: 5
 Gate breakdown:
  {'RY': 16, 'CNOT': 16}

Attributes

num_wires
resource_keys
resource_params	Returns a dictionary containing the minimal information needed to compute the resources.

num_wires = 1

resource_keys = {'num_ctrl_wires', 'precision', 'rotation_axis'}

resource_params

Returns a dictionary containing the minimal information needed to compute the resources.

Returns:

A dictionary containing the resource parameters: * rotation_axis (str): the rotation axis used in the multiplexer * num_ctrl_wires (int): the number of control wires of the multiplexer * precision (float): the precision used in the single qubit rotations

Return type:

dict

Methods

adjoint_resource_decomp(*args, **kwargs)	Returns a list representing the resources for the adjoint of the operator.
controlled_resource_decomp(...)	Returns a list representing the resources for a controlled version of the operator.
dequeue(op_to_remove[, context])	Remove the given resource operator(s) from the Operator queue.
phase_grad_resource_decomp(num_ctrl_wires, ...)	Returns a list representing the resources of the operator.
pow_resource_decomp(pow_z, *args, **kwargs)	Returns a list representing the resources for an operator raised to a power.
queue([context])	Append the operator to the Operator queue.
resource_decomp(num_ctrl_wires, ...)	Returns a list representing the resources of the operator.
resource_rep(num_ctrl_wires, rotation_axis)	Returns a compressed representation containing only the parameters of the Operator that are needed to compute the resources.
resource_rep_from_op()	Returns a compressed representation directly from the operator
tracking_name(*args, **kwargs)	Returns a name used to track the operator during resource estimation.
tracking_name_from_op()	Returns the tracking name built with the operator's parameters.

classmethod adjoint_resource_decomp(*args, **kwargs)

Returns a list representing the resources for the adjoint of the operator.

classmethod controlled_resource_decomp(ctrl_num_ctrl_wires, ctrl_num_ctrl_values, *args, **kwargs)

Returns a list representing the resources for a controlled version of the operator.

Parameters:

• ctrl_num_ctrl_wires (int) – the number of qubits the operation is controlled on

• ctrl_num_ctrl_values (int) – the number of control qubits, that are controlled when in the \(|0\rangle\) state

static dequeue(op_to_remove, context=<class 'pennylane.queuing.QueuingManager'>)

Remove the given resource operator(s) from the Operator queue.

classmethod phase_grad_resource_decomp(num_ctrl_wires, rotation_axis, precision, **kwargs)

Returns a list representing the resources of the operator. Each object in the list represents a gate and the number of times it occurs in the circuit.

Parameters:

• rotation_axis (str) – the rotation axis used in the multiplexer

• num_ctrl_wires (int) – the number of control wires of the multiplexer

• precision (float) – the precision used in the single qubit rotations

• wires (Sequence[int], optional) – the wires the operation acts on

Resources:

The resources are obtained from the construction scheme given in O’Brien and Sünderhauf (2025), Fig 4. Specifically, the resources use two ~.labs.resource_estimation.ResourceQROM`s to digitally load and unload the phase angles up to some precision. These are then applied using a single controlled :code:`~.labs.resource_estimation.ResourceSemiAdder.

Note

This method assumes a phase gradient state is prepared on an auxiliary register.

Returns:

A list of GateCount objects, where each object represents a specific quantum gate and the number of times it appears in the decomposition.

Return type:

list[GateCount]

classmethod pow_resource_decomp(pow_z, *args, **kwargs)

Returns a list representing the resources for an operator raised to a power.

Parameters:

pow_z (int) – exponent that the operator is being raised to

queue(context=<class 'pennylane.queuing.QueuingManager'>)

Append the operator to the Operator queue.

classmethod resource_decomp(num_ctrl_wires, rotation_axis, precision, **kwargs)

Returns a list representing the resources of the operator. Each object in the list represents a gate and the number of times it occurs in the circuit.

Parameters:

• rotation_axis (str) – the rotation axis used in the multiplexer

• num_ctrl_wires (int) – the number of control wires of the multiplexer

• precision (float) – the precision used in the single qubit rotations

• wires (Sequence[int], optional) – the wires the operation acts on

Resources:

The resources are obtained from the construction scheme given in Möttönen and Vartiainen (2005), Fig 7a. Specifically, the resources for an \(n\) qubit unitary are given as \(2^{n}\) instances of the CNOT gate and \(2^{n}\) instances of the single qubit rotation gate (RX, RY or RZ) depending on the rotation_axis.

Returns:

A list of GateCount objects, where each object represents a specific quantum gate and the number of times it appears in the decomposition.

Return type:

list[GateCount]

classmethod resource_rep(num_ctrl_wires, rotation_axis, precision=None)

Returns a compressed representation containing only the parameters of the Operator that are needed to compute the resources.

Parameters:

• rotation_axis (str) – the rotation axis used in the multiplexer

• num_ctrl_wires (int) – the number of control wires of the multiplexer

• precision (float) – the precision used in the single qubit rotations

Returns:

the operator in a compressed representation

Return type:

CompressedResourceOp

resource_rep_from_op()

Returns a compressed representation directly from the operator

classmethod tracking_name(*args, **kwargs)

Returns a name used to track the operator during resource estimation.

tracking_name_from_op()

Returns the tracking name built with the operator’s parameters.

code/api/api/pennylane.labs.resource_estimation.ResourceSelectPauliRot

 

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