A New Quantum Secure Direct Communication Scheme with Authentication

作者:Liu Dan*; Pei Chang-Xing; Quan Dong-Xiao; Zhao Nan
来源:Chinese Physics Letters, 2010, 27(5): 050306.
DOI:10.1088/0256-307X/27/5/050306

摘要

A new quantum secure direct communication (QSDC) scheme with authentication is proposed based on polarized photons and EPR pairs. EPR pairs are used to transmit information, while polarized photons are used to detect Eve and their encoding bases are used to transmit authentication information. Alice and Bob have their own identity number which is shared by legal users only. The identity number is encoded on the bases of polarized photons and distilled if there is no Eve. Compared with other QSDC schemes with authentication, this new scheme is considerably easier and less expensive to implement in a practical setting.