On 06/07/2003 08:04 AM, Udhay Shankar N wrote:I haven't seen this discussed here yet.
I hadn't seen this particular implementation of it discussed here before your posting, but as John points out, the topic has been discussed. It's somewhat cool, but not particularly useful.
On the scale of physics hype, quantum crypto in particular and quantum computation in general are nowhere near as bad as cold fusion, but perhaps comparable to high-Tc superconductors, which had a definite basis in fact, but their practicality was wildly overclaimed.
Quantum computers that can actually do factoring of usefully large numbers would have a major impact on the whole crypto field. But quantum cryptography for sending messages is seldom any more useful than sending an occasional courier with a briefcase handcuffed to his arm, which probably costs a lot less than stringing fiber.
It's also not very useful for preventing traffic analysis :-)
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