[WIP] Add save_expval to extended_stabilizer #2161
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Summary
This PR adds (enables)
save_expval
andsave_expval_var
toextended_stabilizer
requested by #2121Details and comments
save_expval
andsave_expval_var
in extended_stabilizer were disabled because there were bug in expectation values calculation.I found 3 issues:
save_expval_var
was not included inState::check_measurement_opt
Runner::norm_estimation
Now it works for cliffords cases, but it still does not work for non-cliffords cases