Photonic quantum technology can be enhanced by monolithic fabrication of both the underpinning quantum hardware and the corresponding electronics for classical readout and control. Here, by interfacing complementary metal–oxide–semiconductor (CMOS)-compatible silicon and germanium-on-silicon nanophotonics with silicon-germanium integrated amplification electronics, we curtail total capacitance in a homodyne detector to enhance the speed performance of quantum light measurement. The detector has a 3 dB bandwidth of 1.7 GHz, is shot-noise limited to 9 GHz and has a minaturized required footprint of 0.84 mm². We show that the detector can measure the continuous spectrum of squeezing from 100 MHz to 9 GHz of a broadband squeezed light source pumped with a continuous-wave laser, and we use the detector to perform state tomography. This provides fast, multipurpose, homodyne detectors for continuous-variable quantum optics, and opens the way to full-stack integration of photonic quantum devices.

光子量子技术可通过单层制造基础量子硬件和用于经典读出和控制的相应电子器件来增强。在这里，通过将互补金属氧化物半导体（CMOS）兼容的硅和硅锗锗纳米光子与硅锗集成放大电子设备相接口，我们可以减少零差探测器中的总电容，从而提高量子光测量的速度性能。该检测器的3 dB带宽为1.7 GHz，散粒噪声限制为9 GHz，最小化的所需占位面积为0.84 mm ²。我们证明了该检测器可以测量由连续波激光器泵浦的宽带压缩光源从100 MHz压缩到9 GHz的连续频谱，并使用该检测器进行状态层析成像。这为连续变量量子光学提供了快速，多功能的零差探测器，并为光子量子器件的全栈集成开辟了道路。