qml.labs.resource_estimation.ResourceIterativeQPE

class ResourceIterativeQPE(base, num_iter, wires=None)

Bases: ResourceOperator

Resource class for Iterative Quantum Phase Estimation (IQPE).

Parameters:

• base (ResourceOperator) – the phase estimation operator

• num_iter (int) – the number of mid-circuit measurements made to read out the phase

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

Resources:

The resources are obtained following the construction from arXiv:0610214v3.

See also

iterative_qpe()

Example

The resources for this operation are computed using:

>>> gate_set = {"Hadamard", "CRX", "PhaseShift"}
>>> iqpe = plre.ResourceIterativeQPE(plre.ResourceRX(), 5)
>>> print(plre.estimate_resources(iqpe, gate_set))
--- Resources: ---
 Total qubits: 2
 Total gates : 25
 Qubit breakdown:
  clean qubits: 1, dirty qubits: 0, algorithmic qubits: 1
 Gate breakdown:
  {'Hadamard': 10, 'CRX': 5, 'PhaseShift': 10}

Attributes

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

num_wires = 0

resource_keys = {'base_cmpr_op', 'num_iter'}

resource_params

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

Returns:

A dictionary containing the resource parameters:

• base_cmpr_op (CompressedResourceOp): A compressed resource operator, corresponding to the phase estimation operator.

• num_iter (int): the number of mid-circuit measurements made to read out the phase

Return type:

dict

Methods

adjoint_resource_decomp(*args, **kwargs)	Returns a list of actions that define the resources of the operator.
controlled_resource_decomp(...)	Returns a list representing the resources for a controlled version of the operator.
default_adjoint_resource_decomp(*args, **kwargs)	Returns a list representing the resources for the adjoint of the operator.
default_controlled_resource_decomp(...)	Returns a list representing the resources for a controlled version of the operator.
default_pow_resource_decomp(pow_z, *args, ...)	Returns a list representing the resources for an operator raised to a power.
default_resource_decomp(base_cmpr_op, ...)	Returns a list representing the resources of the operator.
dequeue(op_to_remove[, context])	Remove the given resource operator(s) from the Operator queue.
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(*args, **kwargs)	Returns a list of actions that define the resources of the operator.
resource_rep(base_cmpr_op, num_iter)	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
set_resources(new_func[, override_type])	Set a custom function to override the default resource decomposition.
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 of actions that define the resources 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

classmethod default_adjoint_resource_decomp(*args, **kwargs)

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

classmethod default_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

classmethod default_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

classmethod default_resource_decomp(base_cmpr_op, num_iter, **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:

• base_cmpr_op (CompressedResourceOp) – A compressed resource operator, corresponding to the phase estimation operator.

• num_iter (int) – the number of mid-circuit measurements made to read out the phase

Resources:

The resources are obtained following the construction from arXiv:0610214v3.

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]

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

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

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(*args, **kwargs)

Returns a list of actions that define the resources of the operator.

classmethod resource_rep(base_cmpr_op, num_iter)

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

Parameters:

• base_cmpr_op (CompressedResourceOp) – A compressed resource operator, corresponding to the phase estimation operator.

• num_iter (int) – the number of mid-circuit measurements made to read out the phase

Returns:

the operator in a compressed representation

Return type:

CompressedResourceOp

resource_rep_from_op()

Returns a compressed representation directly from the operator

classmethod set_resources(new_func, override_type='base')

Set a custom function to override the default resource decomposition.

This method allows users to replace any of the resource_decomp, adjoint_resource_decomp, ctrl_resource_decomp, or pow_resource_decomp methods globally for every instance of the class.

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.ResourceIterativeQPE

 

Download Python script

 

Download Notebook

 

View on GitHub