Efficient teleportation-based quantum secure communication using quantum channel compression

Abstract

The paper proposes an efficient protocol for direct secure quantum communication that establishes cryptographic keys between two parties. It relies on two-particle teleportation and quantum channel compression (QCC). The teleportation is accomplished via GHZ-like state quantum channel. The process of quantum channel compression is used to encode four-bit symbols into both two-qubit states (Bell states) and two-bit auxiliary symbols. This leads to reducing the overall classical and quantum resources employed to transfer four-bit symbols at any teleportation procedure in the protocol. The novel teleportation-based protocol achieves an efficiency of 0.4 (40%). It is shown that this is the highest value obtained so far by a protocol of this kind.