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Photonic quantum technology can be enhanced by monolithic fabrication of boththe underpinning quantum hardware and the corresponding electronics forclassical readout and control. Together, this enables miniaturisation andmass-manufacture of small quantum devices---such as quantum communicationnodes, quantum sensors and sources of randomness---and promises the precisionand scale of fabrication required to assemble useful quantum computers. Here wecombine CMOS compatible silicon and germanium-on-silicon nano-photonics withsilicon-germanium integrated amplification electronics to improve performanceof on-chip homodyne detection of quantum light. We observe a 3 dB bandwidth of1.7 GHz, shot-noise limited performance beyond 9 GHz and minaturise therequired footprint to 0.84 mm. We use the device to observe quantum squeezedlight, from 100 MHz to 9 GHz, generated in a lithium niobate waveguide. Thisdemonstrates that an all-integrated approach yields faster homodyne detectorsfor quantum technology than has been achieved to-date and opens the way tofull-stack integration of photonic quantum devices.

9~GHz measurement of squeezed light by interfacing silicon photonics and integrated electronics