论文标题
增加与大面积检测器的自由空间量子相干通信的链路距离
Increasing the link-distance of free-space quantum coherent communication with large area detectors
论文作者
论文摘要
我们报告了一个大面积的基于照片二极管的同源探测器，用于自由空间量子相干通信。研究了检测器的性能，以检测带宽和电子噪声来进行射击噪声有限的量子信号检测。与典型的基于纤维的自由空间同源探测器相比，使用大面积的光二极管提高了湍流大气通道的信号收集效率。在相同的大气湍流和接收器孔径条件下，基于直径为1mm的同伴检测器，由于湍流而导致0DB损失，而基于10UM纤维的探测器在700公里的自由空间链路上经历了13.5dB的信号损失，以90度的高度倾斜。
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.
