BaseEstimator

class BaseEstimator(circuits: Iterable[QuantumCircuit] | QuantumCircuit | None = None, observables: Iterable[SparsePauliOp] | SparsePauliOp | None = None, parameters: Iterable[Iterable[Parameter]] | None = None, **kwargs)

Bases: qiskit.primitives.base.base_primitive.BasePrimitive

Estimator base class.

Base class for Estimator that estimates expectation values of quantum circuits and observables.

Creating an instance of an Estimator, or using one in a with context opens a session that holds resources until the instance is close() ed or the context is exited.

Parameters

• circuits – Quantum circuits that represent quantum states.

• observables – Observables.

• parameters – Parameters of quantum circuits, specifying the order in which values will be bound. Defaults to [circ.parameters for circ in circuits] The indexing is such that parameters[i, j] is the j-th formal parameter of circuits[i].

• options – Default options.

Raises

ValueError – For mismatch of circuits and parameters list.

Methods

close	Close the session and free resources
run	Run the job of the estimation of expectation value(s).
set_options	Set options values for the estimator.

Attributes

circuits

Quantum circuits that represents quantum states.

Returns

The quantum circuits.

observables

Observables to be estimated.

Returns

The observables.

options

Return options values for the estimator.

Return type

Options

Returns

options

parameters

Parameters of the quantum circuits.

Returns

Parameters, where parameters[i][j] is the j-th parameter of the i-th circuit.