Re: time reversed entanglement?

From: Patrick Crenshaw (
Date: Sat Jan 21 2006 - 23:31:21 MST

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

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