Paper 13369-41
Paper 13369-41
Counter-propagating spontaneous parametric down-conversion source in lithium niobate on insulator
29 January 2025 • 11:10 AM - 11:30 AM PST | Moscone South, Room 307 (Level 3)
Abstract
Lithium niobate on insulator is a promising platform for integrated quantum photonics. Its strong nonlinear coefficient and electro-optic effect allow the integration of photon pair sources and fast reconfigurable interferometers for many applications like boson sampling, QKD and quantum state generation. The photons are generated via spontaneous parametric down-conversion (SPDC). Two key aspects of the photon pairs are their bandwidth and the possibility to split them deterministically. Here we present a new source type where the generated photons travel in opposite directions and feature a narrow bandwidth of 5 nm in the forward and 20 nm in the backward propagation. The reduction of bandwidth and the separability are big advantages over the type-0-SPDC sources. Compared to the well-known type-2-SPDC sources we achieve a 3.6 times higher efficiency with similar bandwidths.
Presenter
Jost Kellner
ETH Zurich (Switzerland)
Jost Kellner has been a PhD student in Prof Dr Rachel Grange's Optical Materials Group since September 2022. After completing his master's degree at ETH Zurich, he joined the group to work on integrated optics on the lithium niobate-on-insulator (LNOI) platform. During his master's thesis, he worked on a high-speed modulator at 780 nm. He now focuses on nonlinear effects in LNOI by developing periodic poling and devices such as optical parametric oscillators and SPDC sources.