Study of a tactical system for quantum key distribution

Authors:

  • Jonsson Per
  • Kullander Fredrik
  • Sjöqvist Lars

Publish date: 2006-01-01

Report number: FOI-R--1942--SE

Pages: 36

Written in: Swedish

Abstract

Quantum key distribution is a totally secure method to distribute a cryptographic key between two spatially separated parties. Two channels are needed to perform quantum key distribution. One channel is used for transmitting single photons and is usually called the quantum channel. The other channel, usually called the classic (or public) channel, is used for communication between the sender and the receiver to extract a secure (or private) key from the information sent on the quantum channel. The method is described in the first part of the report together with a literature survey on the subject. The possibilities and limitations of the method in tactical application are also discussed. Thereafter are the different parts in a tactical system described, e.g. the quantum transmitter and receiver. There are several benefits of using a free-space communication link also for the classical communication. Especially the possibility of integrating the quantum channel with to retro-communication link is studied and a suggestion of an integrated solution is presented. The transmission rate of the key distribution for a tactical system is analysed together with suggestions how to implement such a system.