Re: Human brains communicating with each other ?

Eric Smith wrote:

> Bernd Paysan <bernd.paysan@xxxxxx> writes:
>> Quantum mechanics does not really tell us whether there's a truly random
>> component, or just a pseudo-random component. Bohm worked on a
>> deterministic QM theory, and his theory gives the same result as the
>> classical Copenhagen interpretaton (with "truly random components").
>
> If it's a pseudo-random component, there must be "hidden variables".
> Aren't hidden variables proven not to exist by Bell's Inequalities?

No, Bell's Inequalities talk about local realistic theories. I.e. a local
realistic theory has to meet the Inequalities (maximum correlation < 2).
Bohm's theory (with hidden variables) is non-local, the Copenhangen QM
(without hidden variables) is non-realistic, and therefore the maximum
correlation < 2*sqrt(2) is possible.

There's no special Observer in Bohm's theory, however, there still are
"spoky action at a distance". The question wether these actions really
exist, or really are non-local, is not completely closed, though the
community believes so:

There are a number of static EPR experiments, which proof nothing, since a
static setup can communicate the settings of the "observers" at light-speed
without problems. Nothing spoky about actions at a distance as such.

There are two dynamic EPR experiments (switched polarizers), which would
indeed proof the point, when they didn't have some "minor" flaws:

- The first one, from Aspect et al used a 50MHz switch at 6m distance from
the light source. So a communication at light-speed would transfer a
previous setting of the switch to the light source, which however is the
same as when the photon finally arrives at the polarizer. So one would
wonder why Aspect et al used this single switch frequency/distance pair,
and didn't notice the flaw (Zeilinger did).

- The second one, from Weihs and Zeilinger, replaced the cyclical switch by
a random switch, taking out any argument in that direction. However, though
they used a very light-sensitive photo-detector, they could not reach a
visibility of more than 50% per single photon (or 25% per coincidence), and
thus did not show a violation of Bell's inequalities at all (maximum
correlation < 0.71 and thus < 2). Unfortunately, they didn't publish this
problem in the EPR article, but later, in a quantum cryptography article.
The 50% visibility could indicate a sinusoid dependency between visibility
and polarizer setup, which doesn't need non-locality at all to explain it.

I think more and better results wether QM really needs to be non-local or
non-realistic will come out of quantum computers. They *need* non-local
effects to work fast. So far, quantum computers with more than a few qbits
slow down significantly, and also are very sensitive for disturbances (and
entanglement is lost then), which sounds more like there has to be a
light-speed communication between everything involved in the experimental
setup.

So summary:

* Hidden variables don't conflict with Bell's Inequalities.

* The theory that Bell's Inequalities are violated under those circumstances
that matter is not verified to full satisfaction.

--
Bernd Paysan
"If you want it done right, you have to do it yourself"
http://www.jwdt.com/~paysan/
.

Relevant Pages

  • Re: Cisco PIX 501 Firewall
    ... 501's 4 port Switch then there is nothing to configure to enable ... communication between the two. ... If you see increasing CRC errors on the PIX's ethernet 1 interface ...
    (comp.dcom.sys.cisco)
  • Re: OT: communication of different lans
    ... Subject: OT: communication of different lans ... A router is the usual way. ... A layer 3 switch does some ...
    (Fedora)
  • Re: OT: communication of different lans
    ... Subject: OT: communication of different lans ... A router is the usual way. ... A layer 3 switch does some ...
    (Fedora)
  • Re: [NT] Quantum of interrupted process
    ... the quantum is accounted since the thread was context ... switched to, so, the counting is reset on each context switch. ... will the scheduler switch to P3 with Q3 ...
    (microsoft.public.development.device.drivers)
  • RE: null values
    ... This works great but how do I switch something under @fields ... re-posting the code that a fellow newsgrouper gave to me for my solution ... If the reader of this message is not the intended recipient, or any employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. ...
    (perl.dbi.users)