Quantum Direct Communication with Continuous Variables

TL;DR

This paper presents a quantum direct communication protocol using continuous variable systems that ensures privacy through phase-space encoding and real-time channel checks, tolerating some noise but stopping if noise exceeds tolerable levels.

Contribution

It introduces a novel continuous variable quantum communication protocol that combines phase-space encoding with real-time channel monitoring for secure message transfer.

Findings

Protocol tolerates small noise levels in the quantum channel.

The protocol effectively limits information leakage when noise is non-tolerable.

Real-time channel checks enhance security against eavesdropping.

Abstract

We show how continuous variable systems can allow the direct communication of messages with an acceptable degree of privacy. This is possible by combining a suitable phase-space encoding of the plain message with real-time checks of the quantum communication channel. The resulting protocol works properly when a small amount of noise affects the quantum channel. If this noise is non-tolerable, the protocol stops leaving a limited amount of information to a potential eavesdropper.