Here's Alastair Rae's review of Deutsch's book "The Beginning of
Infinity". Rae notes that the basis problem seems to bring back the
Heisenberg cut problem in a different form.
He mentions Deutsch's idea which is popularly used to describe a quantum
computer as being massively parallel.
/Deutsch's belief in the existence of the multiverse inspired his
ground-breaking contributions to quantum computing, and he believes that
a successful implementation of a quantum computer would constitute
incontrovertible evidence for it. He argues that the reason a quantum
computer can carry out some tasks very much faster than a classical one
is because the former performs a large number of calculations
simultaneously in parallel universes. However, I believe that this idea
is also challenged by the preferred-basis problem.
/But Scott Aaronson points out that the way quantum algorithms work is
that they arrange for wrong answers to destructively interfere while the
desired answer interferes constructively. Interference requires that
they take place in the same world. /
/Brent
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