High-Performance Imaging in a Dilution Refrigerator

• URL: http://arxiv.org/abs/2510.07054v1
• Date: Wed, 08 Oct 2025 14:22:42 GMT
• Title: High-Performance Imaging in a Dilution Refrigerator
• Authors: Timo Eikelmann, Mara Brinkmann, Leonie Eggers, Tuncay Ulas, Donika Imeri, Konstantin Beck, Lasse Jens Irrgang, Sunil Kumar Mahato, Rikhav Shah, Ralf Riedinger,
• Abstract summary: We report on a robust and versatile confocal imaging system integrated in a dilution refrigerator.<n>Our imaging system achieves a resolution of 1.1 mum and a field-of-view of 2.5 mm.<n>This system will facilitate the development of scalable, integrated quantum optics technology.
• Score: 0.2621533844622817
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Nanophotonic light-matter interfaces hold great promise for quantum technologies. Enhancing local electromagnetic fields, they enable highly efficient detectors, can help realize optically connected processors, or serve as quantum repeaters. In-situ fiber-coupling at sub-Kelvin temperatures, as required for test and development of new devices, proves challenging as suitable cryogenic microscopes are not readily available. Here, we report on a robust and versatile confocal imaging system integrated in a dilution refrigerator, enabling high-resolution visualization of nanophotonic structures on a transparent diamond substrate. Our imaging system achieves a resolution of 1.1 {\mu}m and a field-of-view of 2.5 mm. The system requires no movable parts at cryogenic temperatures and features a large working distance, thereby allowing optical and microwave probe access, as well as direct anchoring of temperature sensitive samples to a cold finger, needed for applications with high thermal load. This system will facilitate the development of scalable, integrated quantum optics technology, as required for research on large scale quantum networks.

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