Quantum Key Distribution Network With Wavelength Addressing

摘要

Conventional applications of quantum cryptography are point-to-point communications, in which only two users can exchange keys. In this letter, we present a network scheme that enable quantum key distribution between multiuser with wavelength addressing. Considering the current state of wavelength division complexing technique, dozens or several hundred users can be connected to such a network and directly exchange keys with each other. With the scheme, a 4-user demonstration network is built up and key exchanges are performed.