Quantum Cryptography over Underground Optical Fibers

Quantum cryptography is an emerging technology in which two parties may simultaneously generate shared, secret cryptographic key material using the transmission of quantum states of light whose security is based on the inviolability of the laws of quantum mechanics. An adversary can neither successfully tap the key transmissions, nor evade detection, owing to Heisenberg's uncertainty principle. In this paper we describe the theory of quantum cryptography, and the most recent results from our experimental system with which we are generating key material over 14-km of underground optical fiber. These results demonstrate that optical-fiber based quantum cryptography could allow secure, real-time key generation over "open" multi-km node-to-node optical fiber communications links between secure "islands."

[1]  F Zappa,et al.  Single-photon detection beyond 1 µm: performance of commercially available germanium photodiodes. , 1994, Applied optics.

[2]  N. Gisin,et al.  Experimental Demonstration of Quantum Cryptography Using Polarized Photons in Optical Fibre over More than 1 km , 1993 .

[3]  Charles H. Bennett,et al.  Quantum cryptography using any two nonorthogonal states. , 1992, Physical review letters.

[4]  Ekert,et al.  Quantum cryptography based on Bell's theorem. , 1991, Physical review letters.

[5]  Emil Wolf,et al.  The Sixth Rochester Conference on Coherence and Quantum Optics , 1990 .

[6]  N. Gisin,et al.  Quantum cryptography over 23 km in installed under-lake telecom fibre , 1996 .

[7]  J. Franson,et al.  Quantum cryptography using optical fibers. , 1994, Applied optics.

[8]  Arjen K. Lenstra,et al.  The Magic Words are Squeamish Ossifrage , 1994, ASIACRYPT.

[9]  P. Townsend,et al.  Quantum key distribution over distances as long as 30 km. , 1995, Optics letters.

[10]  Stephen Wiesner,et al.  Conjugate coding , 1983, SIGA.

[11]  Ueli Maurer,et al.  Generalized privacy amplification , 1994, Proceedings of 1994 IEEE International Symposium on Information Theory.

[12]  J. Rarity,et al.  Single photon interference in 10 km long optical fibre interferometer , 1993 .

[13]  N. Gisin,et al.  Underwater quantum coding , 1995, Nature.

[14]  Richard Hughes,et al.  Quantum crytography over 14km of installed optical fiber , 1996 .

[15]  P R Tapster,et al.  Photon counting with passively quenched germanium avalanche. , 1994, Applied optics.

[16]  J. Rarity,et al.  Enhanced single photon fringe visibility in a 10 km-long prototype quantum cryptography channel , 1993 .

[17]  Gilles Brassard,et al.  Experimental Quantum Cryptography , 1990, EUROCRYPT.

[18]  Gilles Brassard,et al.  Experimental quantum cryptography: the dawn of a new era for quantum cryptography: the experimental prototype is working] , 1989, SIGACT News.