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B Local teleportation using classical entanglement

  1. Dec 2, 2016 #1
    http://onlinelibrary.wiley.com/doi/10.1002/lpor.201500252/abstract

    https://arxiv.org/pdf/1509.06217v2.pdf

    "...it has been implicitly assumed that this scheme is of inherently nonlocal nature, and therefore exclusive to quantum systems. Here, we experimentally demonstrate that the concept of teleportation can be readily generalized beyond the quantum realm"

    "we have shown that teleportation is a general concept, that
    transcends the distinction between classical or quantum systems"

    I thought teleportation is exclusive to QM ?
     
  2. jcsd
  3. Dec 2, 2016 #2
    Teleportation was exclusive to QM. But these authors have re-defined the word to apply classically. It's based on a "cebit" which is a "classical analogue" of the qubit. Meaning, a contraption which has the same (at least, very similar) mathematical formulation, but the underlying physics is completely different. Most important it exhibits no non-locality (or whatever one wants to call that exclusively quantum property). Having defined that analogy, they can, and do, develop analogies for entanglement, teleportation, and no doubt other quantum concepts. Every new analogy is worth another published paper. The concept looks interesting and may stimulate new classical techniques. But - apart from the analogous words - it really has nothing to do with quantum mechanics.
     
  4. Dec 2, 2016 #3

    mfb

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    Staff: Mentor

    From a quick view, it looks like this:

    Write "1" and "0" on two classical letters, put them in envelopes, mix, give one to Alice and one to Bob.
    Alice wants to transmit her bit. She opens the envelope and performs a classical XOR of her bit with the bit in the letter, then sends this information to Bob. Bob uses the information and his letter to reconstruct the teleported bit.
    An unnecessary protocol: Teleporting classical information is pointless as you can fully know the state.

    You can use more than just "1" and "0", but the idea should be the same.
     
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