Applied Physics B

, Volume 79, Issue 3, pp 273–277

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


DOI: 10.1007/s00340-004-1574-7

Cite this article as:
Lorenz, S., Korolkova, N. & Leuchs, G. Appl. Phys. B (2004) 79: 273. doi:10.1007/s00340-004-1574-7


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%.

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  1. 1.Institute of Optics, Information and Photonics, Max Planck Research GroupUniversity Erlangen-NürnbergErlangenGermany
  2. 2.School of Physics and AstronomyUniversity of St. AndrewsSt. AndrewsUK