OK, we keep coming back to "overcoming the laws of physics." But what do you do if consciousness is merely following laws of physics we have not yet discovered? Who CARES about the QM issues at the lowest level of the brain? We no more care about low-level connectivity than we care about that butterfly in Argentina from about 30 years ago.
Let's try this as a (poor) analogy. In the late 1990s/early 2000s there was an Alpha computer which could run any of Tru64 (UNIX), Windows, or OpenVMS. Yet the wiring was always the same. The instructions at the low level of CPU operation always operated the same when executed. It was the data of the Operating System and other programming that decided what the computer did in a given situation. The hardware in those three cases was IDENTICALLY THE SAME. The disks (long-term memory) holding those O/S loads was the same, though what was written on the disks was not the same. Some things that the Alpha did would be highly similar. (There are only a few ways to drive a disk or tape unit.) Some things would be wildly dissimilar. (Web browsers, databases, virtual demand paging, file utility programs, etc.)
If you limit yourself to trying to examine busses and circuits (computer equivalent of neural pathways), you always come up with the same answer, yet their overall behavior would depend on which of the three O/S loads you had requested. Programming in a computer is a second-order characteristic of the computer and depends on its past. That is, the hardware is nature, but the programming is nurture. I suggest that looking for free will has the same problem. Looking for the seat of free will in the physical wiring of the brain (e.g. which nerve connects to which sensory organ) is a wild-goose chase because you are looking in the wrong place. It is what is in the computer's memory (or the person's memory) that determines actions.
We talked about brain-dead people. If the thing that led to brain death wasn't physical destruction of nerve cells, then while on a respirator, their hardware is intact. But they have no consciousness. Do they have free will? Because all the hardware is there, has blood flow, and has the nervous system required to support activity. But nothing is happening. Why? Because that second-order phenomenon called consciousness isn't in play. I suggest that free will lies in the domain of consciousness.
Whatever the brain (or the computer) does at a given time doesn't depend on the hardware. It depends on the software. Which means that looking for a violation of the laws of physics is doomed to failure because the underlying brain biochemical hardware CAN'T violate the laws of physics. But with the chance of having different "software loads" in place, you can still get alternate behaviors. The computer copper or other metal wiring CANNOT violate the laws of physics, because it won't run without them. Yet computers can do different things. Is this because it is what is in their active memories (that is the closest analog we can get to consciousness) that determines activity?
Our problem is that we don't actually know how consciousness works - but we believe that it DOES work. (In fact, the ability to ask the question suggests the existence of consciousness. "I think, therefore I am.") So what does that mean in practical terms? It means that our question of "free will" requires us to understand something we don't yet fully understand. How does a thought become a memory? How do we later act on that thought that we remember in some way? These questions show us that we don't understand that second-order human phenomenon called "consciousness." We are feeling around in the dark in a labyrinthine maze where the old "follow the left wall" rule isn't available.
Earlier,
@Jon, you asked about my response that, in essence, if you made a decision that you thought was made through free will, I said you could not know whether it was actually free will or determinism. The same would be true if it had been made via determinism. If you continue down the path of determinism ignoring the idea that
free will is not to be found in the neural wiring of the brain, you would NEVER be able to know because your proof isn't there. It is elsewhere. (In my not often humble opinion, of course.)