The Hong Ou Mandel Effect shows photons in the same state turning up in the same detector and not at separate detectors.
Does this imply that for any number of identical bosons in exactly the same state, they are either all observed, or none? That there is no way to observe only some? If a detector was set to register exactly one photon - that it would never detect anything, if the state it was detecting had two photons?
For example, if the detector relied on the ejection of an electron from an atom, then the electron would always emerge having absorbed the energy of two photons? That is, all the energy in the photon state?