Volume 84, Number 2, October 2008
|Number of page(s)||6|
|Published online||14 October 2008|
Quantum direct communication with continuous variables
MIT - Research Laboratory of Electronics - Cambridge MA 02139, USA
2 Computer Science, University of York - YO10 5DD York, UK, EU
3 CNISM and Dipartimento di Fisica, Università di Camerino - I-62032 Camerino, Italy, EU
4 MIT - Department of Mechanical Engineering - Cambridge MA 02139, USA
Corresponding author: firstname.lastname@example.org
Accepted: 12 September 2008
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.
PACS: 03.67.Dd – Quantum cryptography and communication security / 03.67.Hk – Quantum communication / 42.50.-p – Quantum optics
© EPLA, 2008
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