BaseEstimatorV2

class qiskit.primitives.BaseEstimatorV2

Bases: ABC

Base class for EstimatorV2 implementations.

An estimator calculates expectation values for provided quantum circuit and observable combinations. Implementations of this BaseEstimatorV2 interface must define their own run() method, which is designed to take the following inputs:

• pubs: list of pubs (Primitive Unified Blocs). An estimator pub is a list

  or tuple of two to four elements that define the unit of work for the estimator. These are:

  • A single QuantumCircuit, possibly parametrized,

    whose final state we define as $\psi(\theta)$.

  • One or more observables (specified as any ObservablesArrayLike, including

    Pauli, SparsePauliOp, str) that specify which expectation values to estimate, denoted $H_j$.

  • A collection parameter value sets to bind the circuit against, $\theta_k$

  • Optionally, the estimation precision.

• precision: the estimation precision. This specification is optional and will be overriden by

  the pub-wise shots if provided.

All estimator implementations must implement default value for the precision in the run() method. This default value will be used any time precision=None is specified, which can take place in the run() kwargs or at the pub level.

Methods

run