Quantum Direct Communication with Continuous Variables

Details Quantum Direct Communication with Continuous Variables Quantum Direct Communication with Continuous Variables

2008-02-05

arxiv.org/abs/0802.0656v3

Europhys. Lett. 84, 20013 (2008)

Physics

Quantum Physics

6 pages, 5 figures, REVTeX

Scientific paper

10.1209/0295-5075/84/20013

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.

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