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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. Re:assumptions by BlueWonder · · Score: 4, Interesting
    Dosent quantum cryptography depend on the assumption that it is impossible to copy this stream of encoded photons without leaving a trace?

    Yes. However, quantum mechanics is an extremely well-established theory.

    As a physicist, I'm reluctant to call anything a fact. However, just because I cannot prove that (say) gravity won't cease to exist tomorrow morning, doesn't mean I live under the constant fear that this might in fact happen. Much in the same way, I'm confident that nothing is wrong with quantum mechanics.

  2. fabric of reality by jest3r · · Score: 5, Interesting

    I was re-reading the Fabric of Reality (David Deutsch) ... which essentially covers Quantum interference / computing (with the arguement that Quantum computing is a result of multiple universes coming together and interfereing with one another) ... In any case this may be a little bit off topic ... but the book echos 'The Matrix Reloaded' in many ways ... Deutsch describes an 'Oracle' who knows everything ... A Virtual Reality machine that interfaces with the brain (even a picture that looks like something out of the Matrix) ... a multiverse (worlds within worlds etc..) ... and a Universal Virtual Reality Generator that can essentially recreate the environment we live in ... in real time. This book pre-dates the original Matrix by a year.