> Look, clearly we’re machines governed by the laws of physics. We’re computers made of meat, as Marvin Minsky put it. This really seem inescapable to me. The remaining arguments all seem like smokescreens. Being able to copy computer programs? Reproducing the running state of even a moderately complex distributed system is effectively impossible, so this argument bothers me not at all. Even if there is some quantum…
"Reproducing the running state of even a moderately complex distributed system is effectively impossible, so this argument bothers me not at all." That's a feature of the Xen hypervisor.[1] You can even migrate a process from one machine to another without stopping it. [1] http://wiki.prgmr.com/mediawiki/index.php/Chapter_9:_Xen_Mig...
And even the Xen example is rough; the new copy of the system will be mostly functionally identical, but any reliance on the state of external things (like remote storage or IO or the state of unfair nondeterministic locks) will rapidly cause state to diverge.
Which only begs the question about how high-fidelity a copy has to be to be a "copy", even in the case of a hypothetical consciousness copy, and leads into the even more subtle question of the time evolution of a person and whether the me of now and the me of twenty seconds ago can be said to represent the same singular "consciousness" at all.