For the purpose intended, finding objects otherwise not readily detected with incoherent visible light, or radar, or similar frequencies, knowing ‘it’s there’ or ‘it’s not there’ is all the information you need. ‘it’s there’ means nothing happened ~ but if ‘it’s not there’ you have a different situation entirely. Now do that a million times a second with gazillions of split photons.
“For the purpose intended, finding objects otherwise not readily detected with incoherent visible light, or radar, or similar frequencies, knowing ‘it’s there’ or ‘it’s not there’ is all the information you need.”
That’s not the intended purpose of this system. It’s meant to determine if there is an object there OR if the photons have been manipulated in an attempt to make it look as if an object is not there. So, that information is simply not enough for this system.