Secure Direct Communication Based on Non-Orthogonal Entangled Pairs and Local Measurement

Abstract

We propose a quantum secure direct communication scheme based on nonorthogonal entangled pairs and local measurement. In this scheme, we use eight nonorthogonal entangled pairs to act as quantum channels. Due to the non-orthogonality of the quantum channels, the present protocol can availably prohibit from all kinds of valid eavesdropping and acquire a secure quantum channel. By local measurement, the sender acquires a secret random sequence. The process of encoding on the random sequence is identical to the one in one-time-pad. So the present protocol is secure. Even for a highly lossy channel, our scheme is also valid. The scheme is feasible with present-day techniques.The combination of quantum mechanics with information theory has produced many interesting and important developments in the field of transmission and processing of information. Quantum key distribution (QKD) is one of the many important applications of quantum mechanics, which provides a secure way to create a private key between two remote parties, the sender, Alice and the receiver, Bob. The non-cloning theorem [1] prohibits a vicious eavesdropper (Eve) from copying perfectly the quantum signal transmitted through a quantum channel, and an eavsdropping event will inevitably disturb the quantum system and leave a track as a result. Alice and Bob can find out Eve by comparing some of the results

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