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Conference on Lasers and Electro-Optics

An On-chip Homodyne Detector for Measuring Quantum States

Dylan H. Mahler, Francesco Raffaelli, Giacomo Ferranti, Philip Sibson, Jake Kennard, Alberto Santamato, Gary F. Sinclair, Damien Bonneau, Mark G. Thompson, Jonathan C. F. Matthews

Published Jan 1, 2017• 3 citations
Publisher

Abstract

Here we present the first quantum homodyne detector on a silicon chip. We demonstrate all of the characteristics required for detection of quantum states: high speed, signal-to-noise ratio, and common-mode rejection ratio.
DOI
10.1364/cleo_at.2017.jth3e.6

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A balanced homodyne detection scheme with nanosecond time resolution and sub-shot-noise sensitivity has been developed and successfully tested yielding an efficient detection scheme for high-speed quantum-optical measurements and communication protocols, for example, quantum cryptography. The parameters of the detector and its precise balancing allow complete characterization of quantum states created by femtosecond light pulses that include the measurement of photon number, optical phase, and statistical properties with a high signal-to-noise ratio for the whole bandwidth from DC to several tens of megahertz. The electronic part of the detector is based on a commercially available amplifier that provides ease of construction and use while yielding good performance.
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.