**From:** Patrick Crenshaw (*patrick.crenshaw@gmail.com*)

**Date:** Sat Jan 21 2006 - 23:31:21 MST

**Next message:**Dani Eder: "Re: Why invest in AGI?"**Previous message:**Damien Broderick: "time reversed entanglement?"**In reply to:**Damien Broderick: "time reversed entanglement?"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ] [ attachment ]

The key thing to remember here is that when they say "information"

they don't mean something that *we* can use but something that

communicates state information from one *particle* to another. Another

way of saying that is to say that all this backward in time stuff goes

out the window as soon as a measurement is made. One difference

between quantum and classical information is that quantum information

is lost when a measurement is made (and you get classical information)

while classical information is not lost.

On 1/21/06, Damien Broderick <thespike@satx.rr.com> wrote:

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*> Quantum Physics, abstract
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*>
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*>
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*> Time-reversal formalism applied to maximal bipartite entanglement:
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*> Theoretical and experimental exploration
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*>
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*> http://arxiv.org/abs/quant-ph/0510048
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*>
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*> Authors:
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*> <http://arxiv.org/abs/quant-ph//find/quant-ph/1/au:+Laforest_M/0/1/0/all/0/1>M.
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*> Laforest,
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*> <http://arxiv.org/abs/quant-ph//find/quant-ph/1/au:+Laflamme_R/0/1/0/all/0/1>R.
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*> Laflamme,
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*> <http://arxiv.org/abs/quant-ph//find/quant-ph/1/au:+Baugh_J/0/1/0/all/0/1>J.
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*> Baugh
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*> Comments: 10 pages, 16 figurers, submitted to PRA
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*> Within the context of quantum teleportation, a proposed intuitive model to
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*> explain bipartite entanglement describes the scheme as being the same qubit
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*> of information evolving along and against the flow of time of an external
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*> observer. We investigate the physicality of such a model by applying the
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*> time-reversal of the Schrodinger equation in the teleportation context. To
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*> do so, we first lay down the theory of time-reversal applied to the circuit
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*> model and then show that the outcome of a teleportation-like circuit is
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*> consistent with the usual tensor product treatment, thus independent of the
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*> physical quantum system used to encode the information. Finally, we
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*> demonstrate a proof of principle experiment on a liquid state NMR quantum
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*> information processor. The experimental results are consistent with the
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*> interpretation that information can be seen as flowing backward in time
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*> through entanglement.
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