Controlled Secure Quantum Communication Using Pure Entangled W Class States

Abstract

We present a controlled secure quantum communication protocol using non-maximally (pure) entangled W states first, and then discuss the basic requirements for a real quantum communication. We show that the authorized two users can exchange their secret messages with the help of the controller after purifying the non-maximally entangled states quantum channel unconditionally securely and simultaneously. Our quantum communication protocol seems even more feasible within present technologies.