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November 10, 2020

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Increasing the link-distance of free-space quantum coherent communication with large area detectors

By Rupesh KumarIgor Konieczniak, Gerald Bonner, Tim Spiller.

Submitted to arXiv on 7 November 2020.

We report a large area photo-diode based homodyne detector for free-space quantum coherent communication. The detector’s performance is studied in terms of detection bandwidth and electronic noise for shot-noise limited quantum signal detection. Using large area photo-diodes increases signal collection efficiency from turbulent atmospheric channels, in comparison with typical fibre based free-space homodyne detectors. Under identical atmospheric turbulence and receiver aperture conditions, our homodyne detector based on 1mm diameter photo-diode experiences 0dB loss due to turbulence while a 10um fibre based detector experiences 13.5dB of signal loss over a 700km free-space link, at 90 degree elevation angle.

Read the whole paper here.