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Estimator

qiskit.primitives.Estimator(*, options=None)GitHub(opens in a new tab)

Bases: BaseEstimatorV1[PrimitiveJob[EstimatorResult]]

Reference implementation of BaseEstimator.

Run Options

  • shots (None or int) – The number of shots. If None, it calculates the exact expectation values. Otherwise, it samples from normal distributions with standard errors as standard deviations using normal distribution approximation.
  • seed (np.random.Generator or int) – Set a fixed seed or generator for the normal distribution. If shots is None, this option is ignored.

Parameters

options (dict(opens in a new tab) | None) – Default options.

Raises

QiskitError – if some classical bits are not used for measurements.


Attributes

options

Return options values for the estimator.

Returns

options


Methods

run

run(circuits, observables, parameter_values=None, **run_options)

Run the job of the estimation of expectation value(s).

circuits, observables, and parameter_values should have the same length. The i-th element of the result is the expectation of observable

obs = observables[i]

for the state prepared by

circ = circuits[i]

with bound parameters

values = parameter_values[i].

Parameters

Returns

The job object of EstimatorResult.

Raises

Return type

T

set_options

set_options(**fields)

Set options values for the estimator.

Parameters

**fields – The fields to update the options

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