qiskit.opflow.expectations.ExpectationBase.compute_variance¶
-
abstract
ExpectationBase.compute_variance(exp_op)[source]¶ Compute the variance of the expectation estimator.
- Parameters
exp_op (
OperatorBase) – The full expectation value Operator after sampling.- Return type
Union[list,complex,ndarray]- Returns
The variances or lists thereof (if exp_op contains ListOps) of the expectation value estimation.