Re: about EPR and the way information travels

From: Bill Hobba (bhobba_at_rubbish.net.au)
Date: 11/03/04 

Date: Wed, 03 Nov 2004 20:59:14 GMT

"Thierry" <-> wrote in message news:41892b45$1@news.vo.lu...
> Hi,
>
> We usually state that a particle cannot move faster than c, but we know
that
> after the colliding of two particles, the quantum state of one particle
can
> be transmitted instantaneously to the other across long distances, even
> ligh-years say physicists.

We do not know that at all. Take a look as the Kochen-Specker theorem
http://plato.stanford.edu/entries/kochen-specker/ which casts strong doubt
on the existence of an external reality (in the usual sense of having
observables existing independent of observation) that has things that can
travel instaneously. Observable that exist independent of observation is a
requirement of the Bell type analysis you are probably talking about. But
even if such obrseverables exist the effect can not be used to send
information faster than light.

>
> We also say that energy cannot move faster than c but well an information
> (the proof with these both particules with different state is an
> information)
> If I am not misleading, do you confirm this second point ?

Information can not be sent faster than light if the lorentz transformations
are true and casualty is to be preserved.

>
> In fact I 'd like a confirmation : is an information equivalent or not to
an
> energy
>

No. But is hard to conceive of a carrier of information that would not
involve energy in some way.

> For me it is (think about entropy). So I conclude that we cannot
> say that an information can travel faster than c (even if EPR experiment
> proof the contrary).

EPR does not say that.

> For me energy and information and two ways to speak about the "state" of
the
> same basic object. Right ?

Interesting point. In QM the state is meant to embody all the information
we can know about a quantum system - so in that sense it is sort of like
information. But it involves more than energy it involves things like spin
and momentum.

Thanks
Bill

>
> Thanks in advance
>
> Thierry
>
>

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