The down quark exchanges one-third of a photon with atoms?
No, how did you get that out of what I wrote? The strength of the interaction is 1/3 that of an electron because the charge of a down quark is 1/3 that of an electron.
Cite the experiment showing that the down quark exchanges photons (or portions of photons) with other atoms.
ALL charged particles exchange photons! That is what makes photons the carrier of the E&M force.
So you do not claim that information is physical according to your definition of "physical".
I am claiming that if you know all the physical properties of the system, you can derive all other properties of that system (like the information). Just like you can derive the entropy or the energy, or the angular momentum.
At that point, it is a matter of labeling. Are such properties physical or not? I'd say yes.
"Physical" is an adjective, except when referring to a bodily exam that a physician performs. Define what you are referring to as "the physical".
All things physical.
[/quote]The wave function is not physical[/QUOTE]Excellent refutation of physicalism.[/QUOTE]
Why do you think that? It still supervenes on the physical, which is all that is important here.
Either the wave function is a purely theoretical construct (in our heads, which means it is an idea and physical in that sense), or probability waves are detectable and are physical more directly.
I generally consider the wave function to be a part of the model, in other words, of our conceptions. That means it is physical simply because our ideas are physical processes.