Secure deterministic bidirectional communication without entanglement
In light of Lucamarini-Mancini's secure deterministic communication without entanglement [Phys. Rev. Lett 94, (2005) 140501], by introducing an additional operation for encoding and additional classical information for decoding, we propose a new secure deterministic bidirectional communication protocol without using entanglement. In our protocol, two legitimate users can simultaneously exchange their different secret messages in a direct way with a set of communication devices. The proposed protocol is asymptotically secure in the limit of transmitting long messages.
bidirectional communication quantum direct communication single qubit