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Nothing magic about it ian. Apparently it is true that anything sufficiently advanced will appear to be magic. Photons cancelling each other out, isn't even that advanced ian, sorry that it seems like magic to you. Perhaps you might do a google search on the topic of photons cancelling each other out.
I have linked to a reference that describes how the waveforms interact when the photons pass each other, and it states that photons pass through each other and carry on as if nothing had happened once they leave the area of interference. you have made the claim that they have been obliterated, destroyed, cancelled out. I would like you to present evidence that I am wrong and you are right. one of us has to be wrong. so far you have ducked the question. the only photons that disappear are virtual photons but we have been discussing radiative photons.
Here ian, a simple, observable, repeatable experiment demonstrating photons cancelling each other out without the benefit of a bit of matter to crash into. And again, virtual photons have no place within this discussion. Virtual photons are theoretical carriers of energy within the confines of an atom between electrons and neutrons or protons. I do wish you would learn that bit of information as well. Your incessant talk of virtual photons in this discussion is one more bit of clear evidence that you just don't know enough about this topic to discuss it intelligently.
Single Particle Interferance
Here is another article that speaks to photons cancelling each other out. You won't find much information on how they cancel each other out or why ian, because the process is not understood. The fact that they do cancel each other out, however, is not disputed because the phenomenon can be seen in the lab.
Successful quantum teleportation between two unconnected atoms one meter apart
and another; see destructive interference.
photons - Anti-laser: How sure we are that energy is transported? - Physics - Stack Exchange
and another; see long term integration.
W6AMT's pointers to pointers
The bottom line ian, is that photons can and do cancel each other out and don't need a brick wall to collide into in order for it to happen. Your knowledge base on this topic is just to thin and your unwillingness to even attempt to grasp what wave particle duality means and its ramifications on the behavior and interaction of EM fields leaves you completely in the dark.
It isn't magic ian, but till you wake up and realize that you are, and have been wrong on this topic all along and start to do some actual research towards learning what is rather than grasping at whatever you believe proves you right, you are going to remain behind the curve.
your first link is just a rewrite of the standard 2 slit diffraction experiment. the photon always shows up somewhere, the probability is greater in some places than others.
the second link is about superposition, a very interesting topic, but no photons disappear they just take specific paths due to the intrinsic qualities of the photons.
the third link is a highly speculative theory about photons not carrying energy themselves but just inducing the vacuum to give up energy.
the fourth link is about radio operators. a quick scan of the numerous topics did not show anything that pertains to our discussion. perhaps you could be more specific.
cant you find a source that talks about everyday conditions, preferably talking about standard radiative tranfers of energy, where photons destroy each other? where does the energy go? what is the mechanism? the references I have seen say that there is no energy transfer in constructive or destructive interference, and that the photons leave the area of interference exactly as they enter.