Silicon photonics interfaced with integrated electronics for 9 GHz measurement of squeezed light

Joel F. Tasker, Jonathan Frazer, Giacomo Ferranti, Euan J. Allen, Léandre F. Brunel, Sébastien Tanzilli, Virginia D'Auria, Jonathan C. F. Matthews*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

50 Citations (Scopus)
160 Downloads (Pure)


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.
Original languageEnglish
Pages (from-to)11-15
Number of pages5
JournalNature Photonics
Issue number1
Early online date9 Nov 2020
Publication statusPublished - 1 Jan 2021

Structured keywords

  • Bristol Quantum Information Institute
  • QETLabs
  • Photonics and Quantum


  • quantum optics
  • quantum physics
  • silicon photonics


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