500MHz resonant photodetector for high-quantum-effciency, low-noise homodyne measurement

TL;DR

This paper presents a resonant photodetector operating at 500MHz designed for low-noise quantum homodyne measurements, achieving high quantum efficiency and a significant signal-to-noise ratio.

Contribution

The paper introduces a novel resonant photodetector design with integrated low-noise amplification for high-frequency quantum measurements, validated by experimental results.

Findings

Achieved 12dB signal-to-noise ratio at 500MHz

Demonstrated low-noise performance with 17MHz bandwidth

Theoretical model matches experimental noise measurements

Abstract

We design and demonstrate a resonant-type differential photodetector for low-noise quantum homodyne measurement at 500MHz optical sideband with 17MHz 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. 12dB of signal-to-noise ratio of the shot noise to the electric noise is obtained with 5mW of 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.