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Entanglement verified as spooky backward in time....

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  Entanglement verified as spooky backward in time.... EricP <ThatWouldBeTelling@thevillage.com> - 2012-04-23 18:19 -0400
    Re: Entanglement verified as spooky backward in time.... nmm1@cam.ac.uk - 2012-04-24 11:48 +0100
    Re: Entanglement verified as spooky backward in time.... Chris Gray <cg@GraySage.com> - 2012-04-24 13:42 -0600
    Re: Entanglement verified as spooky backward in time.... Robert Myers <rbmyersusa@gmail.com> - 2012-04-25 14:10 -0700

#6629 — Entanglement verified as spooky backward in time....

But you knew I was going to say that, didn't you?

Physicists of the group of Prof. Anton Zeilinger at the
Institute for Quantum Optics and Quantum Information (IQOQI),
the University of Vienna, and the Vienna Center for Quantum Science
and Technology (VCQ) have, for the first time, demonstrated in an
experiment that the decision whether two particles were in an entangled
or in a separable quantum state can be made even after these particles
have been measured and may no longer exist. Their results will be
published this week in the journal Nature Physics.

The press release:
Quantum physics mimics spooky action into the past
http://phys.org/news/2012-04-quantum-physics-mimics-spooky-action.html

The grotty details:
Experimental delayed-choice entanglement swapping (2012)
http://arxiv.org/abs/1203.4834

"In neither case Alice and Bob’s photons have communicated or interacted
in the past. This indicates that quantum mechanical predictions are
completely indifferent to the temporal order of Victor’s choice and
measurement with respect to Alice and Bob’s measurements.
Whether Alice and Bob's earlier measurement outcomes indicate
entanglement of photons 1 and 4 strictly depends on which
measurements Victor performs at a later time on photons 2 and 3."

What's your weird-shit-o-meter registering now?

Eric

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#6638

In article <zzklr.7013$zA4.906@newsfe19.iad>,
EricP  <ThatWouldBeTelling@thevillage.com> wrote:
>
>But you knew I was going to say that, didn't you?
>
>The press release:
>Quantum physics mimics spooky action into the past
>http://phys.org/news/2012-04-quantum-physics-mimics-spooky-action.html
>
>The grotty details:
>Experimental delayed-choice entanglement swapping (2012)
>http://arxiv.org/abs/1203.4834
>
>What's your weird-shit-o-meter registering now?

The needle is swinging too wildly for me to read it!

What I don't understand is the veiled references to why Alice
and Bob can't get together, make conclusions, and then send them
to Victor, who can then be perverse and do the opposite of what
Alice and Bob said that he did.  But my understanding of this
level of quantum mechanics is poor :-(

However, to return to the topic of the group, this sort of result
has far more potential for affecting computer architecture in the
future than the near-useless effects observed so far.  Whether
it will do so, and in what way, is unclear to me!


Regards,
Nick Maclaren.

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#6648

EricP <ThatWouldBeTelling@thevillage.com> writes:

> ... the decision whether two particles were in an entangled
> or in a separable quantum state can be made even after these particles
> have been measured and may no longer exist.

Asimov must be grinning.

"The Endochronic Properties of Resublimated Theotimoline"

(Long article on Wikipedia).

--
Chris Gray

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#6656

On Apr 23, 6:19 pm, EricP <ThatWouldBeTell...@thevillage.com> wrote:
>
> What's your weird-shit-o-meter registering now?
>

It's an easy prediction that this result barely scratches the surface
of what we don't understand about time and about quantum mechanics.  I
bent the needle on my own bs-o-meter a long time ago on these
subjects.  It's clear, to me at least, and has been since people
started waving their hands at me in front of a chalkboard about
wavefunction collapse, that no one has a clue.  Lots of smart people,
but the subject needs a Newton or an Einstein, and none such appears
to be at hand.

Robert.

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