22 August 2014 Correction of beam wander for a free-space quantum key distribution system operating in urban environment
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Abstract
Free-space quantum key distribution links in an urban environment have demanding operating needs such as functioning in daylight and under atmospheric turbulence, which can dramatically impact their performance. Both effects are usually mitigated with a careful design of the field of view of the receiver. However, a trade-off is often required, since a narrow field of view improves background noise rejection but is linked to an increase in turbulence-related losses. We present a high-speed automatic tracking system to overcome these limitations. Both a reduction in the field of view to decrease the background noise and a mitigation of the losses caused by atmospheric turbulence are addressed. Two different designs are presented and discussed, along with technical considerations for the experimental implementation. Finally, preliminary experimental results of beam wander correction are used to estimate the potential improvement of both the quantum bit error rate and secret key rate of a free-space quantum key distribution system.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Alberto Carrasco-Casado, Natalia Denisenko, Veronica Fernandez, "Correction of beam wander for a free-space quantum key distribution system operating in urban environment," Optical Engineering 53(8), 084112 (22 August 2014). https://doi.org/10.1117/1.OE.53.8.084112 . Submission:
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