Tim Bartley, Bettina Heim, Dominique Elser, Denis Sych, Metin Sabuncu, Christoffer Wittmann, Norbert Lindlein, Christoph Marquardt, Gerd Leuchs
Abstract. In our continuous variable quantum key distribution (QKD) scheme, the homodyne detection set-up requires balancing the intensity of an incident beam between two photodiodes. Realistic lens systems are insufficient to provide a spatially stable focus in the presence of large spatial beam-jitter caused by atmospheric transmission. We therefore present an improved geometry for optical tapers which offer up to four times the angular tolerance of a lens. The effective area of a photodiode can thus be inc…
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