Quantum key distribution over 30 km of standard fiber using energy-time entangled photon pairs: a comparison of two chromatic dispersion reduction methods
University of Geneva, Group of Applied Physics,
20 rue de l'École-de-Médecine, 1211 Geneva 4, Switzerland
Corresponding author: a Nicolas.Gisin@physics.unige.ch
Published online: 22 June 2004
We present a full implementation of a quantum key distribution system using energy-time entangled photon pairs over a 30 km standard telecom fiber quantum channel. Two bases of two orthogonal states are implemented and the set-up is shown to be robust to environmental constraints such as temperature variation. Two different ways to manage chromatic dispersion in the quantum channel are discussed.
PACS: 03.67.Dd – Quantum cryptography / 03.67.Hk – Quantum communication
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004