Re: TECH: Quantum Head Job

From: Mike Lorrey (
Date: Wed Oct 10 2001 - 08:50:00 MDT

John Clark wrote:
> Adrian Tymes <> Wrote:
> > All this [entangled pairs] does is make the communication instantaneous,
> No it does not, in fact you can't use entangled pairs for communication
> at all, not at any speed. Yes I can change something here and it instantly changes
> something a billion light years away, but that's not good enough because it just
> changes one apparently random state of the receiver into another apparently
> random state. It is only when the sender and receiver compare notes, and that
> can only be done at the speed of light or less, does the connection between
> the two become obvious.
> Quantum teleportation can convey information but it's hard to do and no faster
> than light, probably the only time it would be worth the trouble is to get information
> into and out of a quantum computer. You could use it for quantum encryption too
> but the are other ways to do that and I think they are easier.

The question though, John, is whether you can use two hunks of BEC
(which obviously have an observable rest state) as entangled items, thus
each can act as a speaker for the other's needle. Bump one, and you've
bumped the other.

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