Re: Quantum Cryptography can not work

Unruh wrote:
If I have a probablility distributions with correlations, measuring
something here changes the probability distributions there. Is this
transmission of informations? Is this something here influencing something
there?

Yes it is.

At least the way I'm defining "influencing".

Unless the *only* influence on the probability distribution "there" is
that measuring something here has allowed me to learn something that I
didn't know before, and so the probability distribution there is
different for that reason alone.

That isn't the way it is with EPR - that's why it was called the EPR
paradox. Something actually has to *change* at the other end to
produce the observed probability distribution, because the observed
probability distribution is _inconsistent_ with what happens when
other measurements are made instead.

The fact that this might require *more* than a faster-than-light
connection between the parts of the wave function doesn't make it
require *less*.

I don't insist that the quantum field be explainable in a "classical"
sense; I make only a weaker condition - that it makes sense. That is,
not only does it obey consistent mathematical rules, but that they be
amenable to reductionistic analysis... all the way down. Everything
has an inside.

Or, as Hilbert put it:

Wir müssen wissen, wir werden wissen.

John Savard

.

Loading