No abstract

Quantum communication in general helps deter potential eavesdropping in the course of transmission of bits to enable secure communication between two or more parties. In this paper, we propose a novel quasi-quantum secure direct communication scheme using non-maximally entangled states. The proposed scheme is simple to implement using existing techniques and significantly reduces the number of leaked bits by randomly complementing them. The associated bit error rates are directly controlled by the sender. As a result long sequences or the whole sequence of data can be communicated at once directly, before error checking for a potential eavesdropper. Also a cipher can be used in the protocol for retrieving the bits that are lost due to security. The qubit efficiency of the proposed protocol is found to be 40 %.