Quantum cryptography in optical fibers

Abstract

In this work it is discussed recent developments in the field of quantum cryptography in optical fibers. It is presented several quantum protocols for quantum key distribution, and it is also described the implementation of quantum key distribution with single and entangled photon pairs. Is analysed the quantum key distribution with single photons obtained from weak coherent laser pulses, and it is presented a fine alternative based on the stimulated four-wave mixing in optical fibers. This review provides a state of the art on the field of quantum cryptography in optical fibers.