On 8/2/2019 10:42 AM, Jason Resch wrote:
Quantum computers work by interference of quits, and such
interference can only take place in one world -- different
worlds are orthogonal. The fact that one can analyse a
quantum computer in a particular basis which can be
represented as a series of parallel computations does not
mean that this is actually what happens. Heuristic
constructs seldom correspond to reality.
None of this comes anywhere close to addressing my question.
Well, you have either not understood the question, or my answer to it.
I asked where those 10^1000 intermediate computation states are
realized, and your reply was a basic description of how quantum
computers use qubits and interference. You said this all takes place
in one world, but the total information content and computational
capacity of the observable universe about 800 orders of magnitude less
than 10^1000.
You then added a sentence that suggested the intermediate
computational states perhaps don't exist, but then how does the
correct answer get into the output bits when we read it?
David Deutsch said he has never seen a sensible answer to the question
of how quantum computers work from the context of any single-universe
interpretation. Do you think your answer would satisfy him?
All those "intermediate computation states" are so "numerous" because
the state is being expressed as a superposition of qubit basis states.
From another viewpoint the state is just a single ray in Hilbert space
that happens to not be orthogonal to any of those bases.
Brent
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