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Proceedings Paper

Entanglement based free-space quantum key distribution
Author(s): C. Erven; C. Couteau; R. Laflamme; G. Weihs
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Paper Abstract

We report on the progress of our real-time entanglement based free-space quantum key distribution (QKD) system which uses polarization entangled photon pairs sent over a variety of free-space optical telescope links to distribute the key. An experiment with one photon from each pair sent over a 1,325 m long free-space link and the other photon detected locally next to the source is described. The system performs the complete QKD protocol including all error correction and privacy amplification algorithms. Over the course of 6.5 hours of communication at night an average raw key rate of 1,398 bits/s with an average quantum bit error rate (QBER) of 4.58% was observed producing an average final key rate of 244 bits/s. We also performed a Bell inequality experiment over two free-space links of 435 m and 1,325 m respectively, producing a total separation of 1,575 m between the two detectors in the experiment. During the Bell inequality experiment we observed an average Bell parameter of 2.51 ± 0.11.

Paper Details

Date Published: 12 August 2008
PDF: 7 pages
Proc. SPIE 7099, Photonics North 2008, 709916 (12 August 2008); doi: 10.1117/12.807670
Show Author Affiliations
C. Erven, Univ. of Waterloo (Canada)
C. Couteau, Univ. of Waterloo (Canada)
R. Laflamme, Univ. of Waterloo (Canada)
Perimeter Institute (Canada)
G. Weihs, Univ. of Waterloo (Canada)


Published in SPIE Proceedings Vol. 7099:
Photonics North 2008

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