ExpectationBase.compute_variance

abstract ExpectationBase.compute_variance(exp_op)

Compute the variance of the expectation estimator.

Parameters

exp_op (OperatorBase) – The full expectation value Operator after sampling.

Return type

Union[list, float, complex, ndarray]

Returns

The variances or lists thereof (if exp_op contains ListOps) of the expectation value estimation.