[API] de-duplicate the `get_expectation_value` and `get_single_exp_value_and_std` methods

qiskit-community / povm-toolbox

A toolbox for the implementation of positive operator-valued measures (POVMs).

Apache License 2.0

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Closed mrossinek closed 3 weeks ago

mrossinek commented 1 month ago

Currently, the POVMPostProcessor provides two methods:

We should unify the interface such that:

we always compute expectation value and standard deviation
we have a single method that deals with the appropriate shapes of the results that are being processed