2002/03/15 by Kim Bostroem, Timo Felbinger · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.89.187902
published as Phys. Rev. Lett. 89, 187902 (2002) · 4 pages, 5 figures, REVTEX
arxiv created 2002/03/15 · arxiv updated 2013/05/29
A novel communication protocol based on an entangled pair of qubits is presented, allowing secure direct communication from one party to another without the need for a shared secret key. Since the information is transferred in a deterministic manner, no qubits have to be discarded and every qubit carries message information. The security of the transfer against active and passive eavesdropping attacks is provided. The detection rate of active attacks is at least 25%. The protocol works with a quantum efficiency of 1 bit per qubit transmitted.