Skip to content

A Homodyne Detector Integrated onto a Photonic Chip for Measuring Quantum States and Generating Random Numbers

Research output: Contribution to journalArticle

Original languageEnglish
Article number025003
Number of pages9
JournalQuantum Science and Technology
Issue number2
Early online date7 Feb 2018
DateAccepted/In press - 21 Dec 2017
DateE-pub ahead of print - 7 Feb 2018
DatePublished (current) - Apr 2018


Optical homodyne detection has found use as a characterization tool in a range of quantum; technologies. So far implementations have been limited to bulk optics. Here we present the optical; integration of a homodyne detector onto a silicon photonics chip. The resulting device operates; at high speed, up 150 MHz, it is compact and it operates with low noise, quantified with 11 dB; clearance between shot noise and electronic noise. We perform on-chip quantum tomography of; coherent states with the detector and show that it meets the requirements for characterising more; general quantum states of light. We also show that the detector is able to produce quantum random; numbers at a rate of 1.2 Gbps generation rate, by measuring the vacuum state of the electromagnetic; field-the produced random numbers pass all the statistical tests provided by the NIST statistical; test suite.

    Structured keywords

  • QETLabs
  • Bristol Quantum Information Institute

Download statistics

No data available



  • Full-text PDF (final published version)

    Rights statement: This is the final published version of the article (version of record). It first appeared online via IOP at . Please refer to any applicable terms of use of the publisher.

    Final published version, 1.18 MB, PDF document

    Licence: CC BY


View research connections

Related faculties, schools or groups