Add ability to get counts from statevectors and density matrices #3514
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nonhermitian
requested review from
ajavadia,
chriseclectic,
diego-plan9,
mtreinish and
taalexander
as code owners
|
Can we make this work for density matrices as well? I think a convenient function to obtain counts from states is nice, but also we need some way of getting probability of any observable, not just computational basis. @chriseclectic mentioned something along these lines exists for statevector but I couldn't really find it. Can you paste some code examples here @chriseclectic ? |
nonhermitian
changed the title
|
Now works for density matrix objects as well. |
ajavadia
approved these changes
Nov 27, 2019
mtreinish
added
the
Changelog: New Feature
faisaldebouni
pushed a commit
to faisaldebouni/qiskit-terra
that referenced
this pull request
Aug 5, 2020
…kit#3514) * add state to counts * add to result and tests * style * cleanup * add DM version and tests * lint
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Summary
Adds the ability to get counts from statevectors. The counts are the numerically exact probabilities that one would expect to come from a given statevector. This is very useful in comparing theoretical bitstring output distributions verses those actually obtained in the experiment or noisy simulations.
Related to #3510
Details and comments