Quantum Direct Communication with Continuous Variables

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.

6 pages, 5 figures, REVTeX

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• Experimental free-space quantum secure direct communication and its security analysis
• Confidential direct communications: a quantum approach using continuous variables
• Continuous-variable quantum communication
• Continuous variable controlled quantum dialogue and secure multiparty quantum computation
• Exploiting Spatial Diversity in Earth-to-Satellite Quantum-Classical Communications