qml.estimator.templates.IterativeQPE

class IterativeQPE(base, num_iter)

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 performed to read out the phase

Resources:

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

See also

iterative_qpe()

Example

The resources for this operation are computed using:

>>> import pennylane.estimator as qre
>>> gate_set = {"Hadamard", "CRX", "PhaseShift"}
>>> iqpe = qre.IterativeQPE(qre.RX(), 5)
>>> print(qre.estimate(iqpe, gate_set))
--- Resources: ---
Total wires: 2
    algorithmic wires: 1
    allocated wires: 1
    zero state: 1
    any state: 0
Total gates : 25
'CRX': 5,
'PhaseShift': 10,
'Hadamard': 10

Attributes

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

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

resource_decomp(base_cmpr_op, num_iter)	Returns a list representing 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.

classmethod resource_decomp(base_cmpr_op, num_iter)

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]

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

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