, Volume 79, Issue 3, pp 273-277
Date: 29 Jun 2004

Continuous-variable quantum key distribution using polarization encoding and post selection

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We present an experimental demonstration of a quantum key distribution protocol using coherent polarization states. Post selection is used to ensure a low error rate and security against beam-splitting attacks even in the presence of high losses. Signal encoding and readout in polarization bases avoids the difficult task of sending a local oscillator with the quantum channel. This makes our setup robust and easy to implement. A shared key was established for losses up to 64%.