Title :
Single photon interference in 10 km long optical fibre interferometer
Author :
Townsend, Paul D. ; Rarity, J.G. ; Tapster, P.R.
Author_Institution :
BT Labs., Ipswich, UK
fDate :
4/1/1993 12:00:00 AM
Abstract :
Single-photon interference fringes with greater than 90% visibility were measured using a 10 km long optical fibre interferometer. The experiment employed a pulsed semiconductor laser source operating at a wavelength of 1.3 mu m and a novel single-photon counting scheme using high-speed germanium avalanche photodiodes. Interferometers of this type could form the basis of future quantum cryptography systems.
Keywords :
avalanche photodiodes; cryptography; elemental semiconductors; germanium; light interferometers; optical communication; optical communication equipment; 1.3 micron; 10 km; APD; Ge avalanche photodiode; experiment; long optical fibre interferometer; pulsed semiconductor laser source; quantum cryptography systems; secret key transmission; semiconductors; single photon interference; single-photon counting scheme; wavelength;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19930424
