Experimental Demonstration of Quantum Cryptography Using Polarized Photons in Optical Fibre over More than 1 km
A Muller, Jacques Breguet, Nicolas Gisin · Europhysics Letters (EPL) · 1993
A quantum cryptography set-up is described. It uses polarized photons to code the key. The photons remain guided from the semiconductor laser diode until the photon counter module. The feasibility of establishing a key over more than 1 km by this method has been experimentally demonstrated.