You have exactly the same evidence for other people having qualia, as you do for > a simulation of a person having qualia: namely, that the person or simulation says >they do.
No,. there is extra evidence that other people have qualia: you know they are made
out of stuff that can generate qualia, because it is the stuff you are made of.
Then the question is whether reality is Turing computable, and we currently have no reason to believe it isn’t.
No, that isn’t the question: it is naturalistically possible for qualia to only
exist “on the metal”. And the computability of physics is a much more complex
subject than you are assuming.
“A decisive refutation of any claim that our reality is computer-simulated would be the discovery of some uncomputable physics, because if reality is doing something that no computer can do, it cannot be a computer simulation. (Computability generally means computability by a Turing machine. Hypercomputation (super-Turing computation) introduces other possibilities which will be dealt with separately). In fact, known physics is held to be (Turing) computable,[11] but the statement “physics is computable” needs to be qualified in various ways. Before symbolic computation, a number, thinking particularly of a real number, one with an infinite number of digits, was said to be computable if a Turing machine will continue to spit out digits endlessly, never reaching a “final digit”.[12] This runs counter, however, to the idea of simulating physics in real time (or any plausible kind of time). Known physical laws (including those of quantum mechanics) are very much infused with real numbers and continua, and the universe seems to be able to decide their values on a moment-by-moment basis. As Richard Feynman put it:[13]
"It always bothers me that, according to the laws as we understand them today, it takes a computing machine an infinite number of logical operations to figure out what goes on in no matter how tiny a region of space, and no matter how tiny a region of time. How can all that be going on in that tiny space? Why should it take an infinite amount of logic to figure out what one tiny piece of space/time is going to do? So I have often made the hypotheses that ultimately physics will not require a mathematical statement, that in the end the machinery will be revealed, and the laws will turn out to be simple, like the chequer board with all its apparent complexities".
The objection could be made that the simulation does not have to run in “real time”.[14] It misses an important point, though: the shortfall is not linear; rather it is a matter of performing an infinite number of computational steps in a finite time.[15]”
No,. there is extra evidence that other people have qualia: you know they are made out of stuff that can generate qualia, because it is the stuff you are made of.
No, that isn’t the question: it is naturalistically possible for qualia to only exist “on the metal”. And the computability of physics is a much more complex subject than you are assuming.
“A decisive refutation of any claim that our reality is computer-simulated would be the discovery of some uncomputable physics, because if reality is doing something that no computer can do, it cannot be a computer simulation. (Computability generally means computability by a Turing machine. Hypercomputation (super-Turing computation) introduces other possibilities which will be dealt with separately). In fact, known physics is held to be (Turing) computable,[11] but the statement “physics is computable” needs to be qualified in various ways. Before symbolic computation, a number, thinking particularly of a real number, one with an infinite number of digits, was said to be computable if a Turing machine will continue to spit out digits endlessly, never reaching a “final digit”.[12] This runs counter, however, to the idea of simulating physics in real time (or any plausible kind of time). Known physical laws (including those of quantum mechanics) are very much infused with real numbers and continua, and the universe seems to be able to decide their values on a moment-by-moment basis. As Richard Feynman put it:[13]
The objection could be made that the simulation does not have to run in “real time”.[14] It misses an important point, though: the shortfall is not linear; rather it is a matter of performing an infinite number of computational steps in a finite time.[15]”