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Quantum Cryptography: 100km Barrier Broken

Posted by timothy on from the speaking-of-crypto dept.

jdfox writes "Toshiba Research Europe have just demonstrated quantum crypto over 100km fibre links. Sounds like there's still a fair bit of work to be done before it leaves the lab, but it's amazing that they've got as far as they have. There's another article about it, though still not much technical detail, here on the BBC and here on The Register."

2 of 194 comments (clear)

  1. assumptions by Photon01 · · Score: 4, Insightful

    From the Register article:

    Ultimately, quantum cryptography seeks to deliver a method of communication whose secrecy does not depend upon any assumptions.

    Dosent quantum cryptography depend on the assumption that it is impossible to copy this stream of encoded photons without leaving a trace?

    1. Re:assumptions by djpig · · Score: 4, Insightful

      Hmm, physical laws are actually not facts...

      They are more best explanations for which no counterevidence exists yet or explanations that describe the problem as good as needed