On 4/6/2022 5:23 PM, smitra wrote:
On 07-04-2022 00:58, Bruce Kellett wrote:
On Thu, Apr 7, 2022 at 8:22 AM smitra <smi...@zonnet.nl> wrote:
On 06-04-2022 13:35, Bruce Kellett wrote:
I agree. Entanglement is a distinctively quantum phenomenon and
cannot
be simulated classically. But that does not mean that using a
quantum
computer will necessarily enable you to simulate a Bell
experiment.
The quantum computer operates essentially by classical logic. So
unless you somehow generate a quantum entanglement (outside of the
necessary entanglement for the operation of the computer's
qubits),
you are not going to be able to simulate a Bell entangled state,
even
on a quantum computer.
You can't do it "from the outside" but you can consider observers
simulated by a quantum computer.
But then you have the problem of whether "observers" simulated by a
quantum computer can actually make measurements. The essence of a
measurement is the formation of permanent records in the environment.
It's perfectly possible for an observer to make an observation without
there being any permanent record. The physical processes that makes
someone be able to see and feel something has noting to do with the
formation of permanent records.
But it has everything to do with seeing and feeling something
definite...not a superposition.
Quantum computers cannot do this unless they stop and print out a
result. Your quantum computer simulation requires a redefinition of
the concept of measurement so that it becomes essentially meaningless.
It forces one to come up with a more reasonable definition of
measurement. If I observe something, then that's because there is a
brain that's running the algorithm that corresponds to that
observation. In the context of the MWI one then needs to assume that
there exists algorithms for observations made by Alice and Bob which
then defines the required preferred basis.
And a what "preferred" means is that the observation produces
eigenvalues and eigenvectors in that basis.
Brent
Saibal
Bruce
The dynamics of a quantum computer is
manifestly local and unitary, so it provides for a transparent
argument.
Saibal
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