Abstract
Most applications of quantum cryptography would require a global system capable of secure communications between any two locations on Earth. Current systems for quantum cryptography are based on the use of optical fibres and their ranges are limited by the absorption or scattering of the photons in the fiber. The use of amplifiers would destroy the quantum-mechanical coherence necessary for quantum cryptography, so that the useful range of fiber-based systems cannot be much more than the decay length of a photon in optical fiber.
© 1996 Optical Society of America
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