Serikawa Takahiro, Furusawa Akira
Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Rev Sci Instrum. 2018 Jun;89(6):063120. doi: 10.1063/1.5029859.
We design and demonstrate a resonant-type differential photodetector for a low-noise quantum homodyne measurement at 500 MHz optical sideband with 17 MHz of bandwidth. By using a microwave monolithic amplifier and a discrete voltage buffer circuit, a low-noise voltage amplifier is realized and applied to our detector. 12 dB of signal-to-noise ratio of the shot noise to the electric noise is obtained with 5 mW of a continuous-wave local oscillator. We analyze the frequency response and the noise characteristics of a resonant photodetector, and the theoretical model agrees with the shot noise measurement.
我们设计并演示了一种用于500 MHz光边带、带宽为17 MHz的低噪声量子零差测量的谐振型差分光电探测器。通过使用微波单片放大器和分立电压缓冲电路，实现了一种低噪声电压放大器并将其应用于我们的探测器。在5 mW连续波光本振的情况下，散粒噪声与电噪声的信噪比达到12 dB。我们分析了谐振光电探测器的频率响应和噪声特性，理论模型与散粒噪声测量结果相符。
