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Optical and Quantum Sensing and Precision Metrology II

Electronic-photonic integrated homodyne detectors for quantum state measurement

Jonathan C. F. Matthews

Published Mar 13, 2024• 0 citations
Publisher
DOI
10.1117/12.3011690

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Optical homodyne detection has found use as a characterisation 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, by measuring the vacuum state of the electromagnetic field and applying off-line post processing. The produced random numbers pass all the statistical tests provided by the NIST test suite.
Summary form only given. The homodyne detector is a primitive element in many quantum optics experiments. It is primarily a characterization device, used for measuring the quantum state of the electromagnetic field[1]. Quantum integrated photonics[2], in which optical sources, circuits, and detectors are monolithically integrated on a semiconductor chip, provides a compact, scalable, platform in which to implement quantum devices like the homodyne detector. Here, we present a homodyne detector integrated in silicon and use it to generate quantum random numbers.