  Despite their theoretical importance, dynamic Bayesian networks associated
with quantum processes are currently not accessible experimentally. We here
describe a general scheme to determine the multi-time path probability of a
Bayesian network based on local measurements on independent copies of a
composite quantum system combined with postselection. We further show that this
protocol corresponds to a non-projective measurement. It thus allows the
investigation of the multi-time properties of a given local observable while
fully preserving all its quantum features.
