In-Line Fiber-Integrated Photon-Pair Generation from van der Waals Crystals

• URL: http://arxiv.org/abs/2603.24070v1
• Date: Wed, 25 Mar 2026 08:24:49 GMT
• Title: In-Line Fiber-Integrated Photon-Pair Generation from van der Waals Crystals
• Abstract summary: Miniaturized quantum light sources that operate directly in optical fibers are an attractive platform for optical quantum technologies.<n>Here we demonstrate a lens-free in-line SPDC photon-pair source by integrating a van der Waals NbOI2 flake directly onto the end facet of an optical fiber.<n>In this configuration, the generated photon- pairs are efficiently collected into optical fibers, eliminating the need for bulk free-space collection optics.
• Score: 2.3002991958356005
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Miniaturized quantum light sources that operate directly in optical fibers are an attractive platform for optical quantum technologies. However, most miniaturized spontaneous parametric down- conversion (SPDC) sources still rely on objective-lens-based free-space pumping and collection, which limits compactness, robustness, and direct compatibility with fiber-based systems. Here we demonstrate a lens-free in-line SPDC photon-pair source by integrating a van der Waals NbOI2 flake directly onto the end facet of an optical fiber. In this configuration, the generated photon- pairs are efficiently collected into optical fibers, eliminating the need for bulk free-space collection optics. Despite the limited numerical aperture of the single-mode fiber, efficient photon-pair collection with high purity, characterized by a coincidence-to-accidental ratio of up to ~4600, is achieved in an ultracompact configuration. These results establish van der Waals ferroelectric materials as a promising platform for fiber-integrated quantum light sources and provide a pathway toward compact, alignment-free quantum photonic devices.

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