Single-photon detection and cryogenic reconfigurability in lithium niobate nanophotonic circuits

Emma Lomonte, Martin A. Wolff, Fabian Beutel, Simone Ferrari, Carsten Schuck, Wolfram H. P. Pernice () and Francesco Lenzini ()
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Emma Lomonte: University of Muenster
Martin A. Wolff: University of Muenster
Fabian Beutel: University of Muenster
Simone Ferrari: University of Muenster
Carsten Schuck: University of Muenster
Wolfram H. P. Pernice: University of Muenster
Francesco Lenzini: University of Muenster

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Lithium-Niobate-On-Insulator (LNOI) is emerging as a promising platform for integrated quantum photonic technologies because of its high second-order nonlinearity and compact waveguide footprint. Importantly, LNOI allows for creating electro-optically reconfigurable circuits, which can be efficiently operated at cryogenic temperature. Their integration with superconducting nanowire single-photon detectors (SNSPDs) paves the way for realizing scalable photonic devices for active manipulation and detection of quantum states of light. Here we demonstrate integration of these two key components in a low loss (0.2 dB/cm) LNOI waveguide network. As an experimental showcase of our technology, we demonstrate the combined operation of an electrically tunable Mach-Zehnder interferometer and two waveguide-integrated SNSPDs at its outputs. We show static reconfigurability of our system with a bias-drift-free operation over a time of 12 hours, as well as high-speed modulation at a frequency up to 1 GHz. Our results provide blueprints for implementing complex quantum photonic devices on the LNOI platform.

Date: 2021
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DOI: 10.1038/s41467-021-27205-8

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