Abstract: Using an integrated equipment,we build a quantum key distribution experiment platform.Taking fiber at 850 nm as quantum channel,the platform uses attenuated polarization modulated single photons as information carriers,and combines with the general communications channel to randomly generate quantum key.This experimental is colosely intgrated the latest achievements of quatum information research and development,and the experimental design is innovative and prominent features,which isonductive to students to intuitiely understand quantum key distribution process in depth.

Key words: BB84 protocol, quantum key distribution, single photon, optical fiber