Integrated quantum key distribution system using single sideband detection
Abstract
We report a new quantum cryptographic system involving single sideband detection and allowing an implementation of the BB84 protocol. The transmitted bits are reliably coded by the phase of a high frequency modulating signal. The principle of operation is described in terms of both classical and quantum optics. The method has been demonstrated experimentally at 1 550 nm using compact and conventional device technology. Single photon interference has been obtained with a fringe visibility greater than 98%, indicating that the system can be used in view of quantum key distribution potentially beyond 50-km-long standard single-mode fiber.
- Publication:
-
European Physical Journal D
- Pub Date:
- February 2002
- DOI:
- Bibcode:
- 2002EPJD...18..141M
- Keywords:
-
- PACS. 03.67.Dd Quantum cryptography – 42.79.-e Optical elements;
- devices;
- and systems;
- 03.67.Dd;
- 42.79.-e;
- Quantum cryptography;
- Optical elements devices and systems