Re: A Look at Quantum "Spookiness"
- From: "Tao" <not@xxxxxxxxxxxx>
- Date: Fri, 03 Mar 2006 17:56:05 GMT
"Erops" <erops@xxxxxxx> wrote in message
news:220df$44086508$d8080e77$30809@xxxxxxxxxxxxxxxx
A Look at Quantum "Spookiness"
The results of quantum theory were described as "spooky" by Drs.
Einstein, Podalsky, and Rosen because quantum theory seemed to reject
"objective reality". They believed that all observed effects must be
produced by "local" causality. Their conclusion resulted from their firm
belief that information could not travel faster than the velocity of
light. Indeed, if this were the case, quantum theory would indeed be
"spooky". Quantum theory required, for example, that "paired photons"
maintain polarizations which were opposite in direction . If the
polarization angle of one of the "paired photons" were changed, the
polarization angle of the other photon of the pair must instantaneously
change to match.
Actually this is not a very accurate description of the situation. It is
about determining the polarization, not changing it. The key thing is that
one can measure the polarization in two directions which are incompatible
observables in quantum mechanics, so the results cannot be explained merely
by the states the particles started off in. Which direction to measure can
be chosen by a central controller communicating simultaneously with each end
of the experiment.
If you read the papers about Aspect's experiment (which verified Bell's
theorem empirically), as I have, you will see Bell's result is only visible
in the statistics, not in any individual measurement. No-one has found any
way to use this effect to communicate faster than light, and very few people
expect this to ever happen.
.
- Follow-Ups:
- Re: A Look at Quantum "Spookiness"
- From: Daniel Pitts
- Re: A Look at Quantum "Spookiness"
- References:
- A Look at Quantum "Spookiness"
- From: Erops
- A Look at Quantum "Spookiness"
- Prev by Date: Re: "Another Rebuff to General Relativity By Cosmological Observations"
- Next by Date: Re: Borders Group Mind Control (Wenzlaff -- covert military)
- Previous by thread: A Look at Quantum "Spookiness"
- Next by thread: Re: A Look at Quantum "Spookiness"
- Index(es):
Relevant Pages
|
