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Quantum 2.0 Conference and Exhibition

Integrated Quantum Photonics in χ^(2) Materials: Development, Fabrication and Their use for on-Chip Quantum Optics

Laura Padberg

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We show our development on devices that enable the realization of quantum optical applications on chip. We present the design and fabrication of devices in ferroelectric materials especially in thin-film lithium niobate. Full-text article not available; see video presentation
DOI
10.1364/quantum.2024.qm5b.1

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High Resolution Image Download MS PowerPoint Slide Lithium niobate, because of its nonlinear and electro-optical properties, is one of the materials of choice for photonic applications. The development of nanostructuring capabilities of thin film lithium niobate (TFLN) permits fabrication of small footprint, low-loss optical circuits. With the recent implementation of on-chip single-photon detectors, this architecture is among the most promising for realizing on-chip quantum optics experiments. In this Letter, we report on the implementation of superconducting nanowire single-photon detectors (SNSPDs) based on NbTiN on 300 nm thick TFLN ridge nano-waveguides. We demonstrate a waveguide-integrated wavelength meter based on the photon energy dependence of the superconducting detectors. The device operates at the telecom C- and L-bands and has a footprint smaller than 300 × 180 μm 2 and critical currents between ∼12 and ∼14 μA, which ensures operation with minimum heat dissipation. Our results hold promise for future densely packed on-chip wavelength-multiplexed quantum communication systems.