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Does error mitigation work with non-diagonal/multi-term observables? #1728

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@BrunoLiegiBastonLiegi

I was having some problems with error mitigation and I just noticed that the error_sensitive_circuit method only considers the firs term of the observable here:

terms = observable.terms[0].factors

is this expected?
What happens if I have a multi term hamiltonian or a non diagonal one, are our methods expected to work?
@AlejandroSopena maybe you can help me out here.

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