Quantum Direct Communication with Continuous Variables
  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. 
Stefano Pirandola, Samuel L. Braunstein, Stefano Mancini and Seth   Lloyd