Re: Quantum entanglement as upload checksum?

From: Anders Sandberg (asa@nada.kth.se)
Date: Mon Mar 03 2003 - 16:33:29 MST

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    On Mon, Mar 03, 2003 at 04:23:34PM -0500, Bret Kulakovich wrote:
    >
    > If we entangle electrons both within a person's brain and outside of
    > a person's brain, and then that person uploads into a system, could
    > the entangled electrons be used post-upload to check against and
    > determine that this person is in fact, the "original" and not a copy?

    The uploading process will likely cause the entanglement to be lost;
    while I doubt anybody will ever try to measure every electron in a brain
    during an upload, such a process is very likely to cause a lot of
    decoherence and hence have roughly the same effect as a random
    disturbance of the electron.

    > This is assuming that the upload is a process that does not leave an
    > original copy somehow.

    So even if the entanglement is not lost, the other electron will just be
    in the discarded organic parts. It won't tell you anything about the
    real state of the upload.

    Try, try again. I would love to see some more uses for entanglement!

    One idea, related to quantum crypto: quantum tamperproofing. A device is
    surrounded by fiber optics, through which streams of entangled particles
    are sent. If one is broken, the device knows it has been attacked. But
    it could also run a quantum crypto protocol to see if some more subtle
    method has gained access - that will cause a telltale change in the
    entanglement.

    -- 
    -----------------------------------------------------------------------
    Anders Sandberg                                      Towards Ascension!
    asa@nada.kth.se                            http://www.nada.kth.se/~asa/
    GCS/M/S/O d++ -p+ c++++ !l u+ e++ m++ s+/+ n--- h+/* f+ g+ w++ t+ r+ !y
    


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