  We propose a quantum protocol addressing the problem of conformance test, the
task of recognizing whether or not a certain process conforms to a reference
one. Specifically, we analyze the scenario where tested process produces an
outcome that can be modeled by an ensemble of pure loss quantum channels. While
this task involves in general a continuous parameters distribution of the
outcome, the required answer is binary. For this reason we formulate the
problem in the context of quantum hypothesis testing and we show that quantum
resources, namely TMSV states, and a simple receiver design based on a photon
counting measurement are able to outperform any classical strategy. Our model
?ts and can find application in transmission sensing an spectroscopy, for
example with potential application to the quality check of chemicals production
process.
