Secure Deterministic Communication Without Entanglement

Abstract

We propose a protocol for deterministic communication that does not make use of entanglement. It exploits nonorthogonal states in a two-way quantum channel attaining significant improvement of security and efficiency over already known cryptographic protocols. The presented scheme, being deterministic, can be devoted to direct communication as well as to key distribution, and its experimental realization is feasible with present day technology.

4 pages, 2 figures. Corrected typos in the field "Authors"; added one reference

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