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arXiv · 2503.22423

Light Storage in Light Cages: A Scalable Platform for Multiplexed Quantum Memories

Esteban Gómez-López·Dominik Ritter·Jisoo Kim·Harald Kübler·Markus A. Schmidt·Oliver Benson
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Abstract

Quantum memories are essential for photonic quantum technologies, enabling long-distance quantum communication and serving as delay units in quantum computing. Hot atomic vapors using electromagnetically induced transparency provide a simple platform with second-long photon storage capabilities. Light-guiding structures enhance performance, but current hollow-core fiber waveguides face significant limitations in filling time, physical size, fabrication versatility, and large-scale integration potential. In this work, we demonstrate the storage of attenuated coherent light pulses in a cesium (Cs) quantum memory based on a 3D-nanoprinted hollow-core waveguide, known as a light cage (LC), with several hundred nanoseconds of storage times. Leveraging the versatile fabrication process, we successfully integrated multiple LC memories onto a single chip within a Cs vapor cell, achieving consistent performance across all devices. We conducted a detailed investigation into storage efficiency, analyzing memory lifetime and bandwidth. These results represent a significant advancement toward spatially multiplexed quantum memories and have the potential to elevate memory integration to unprecedented levels. We anticipate applications in parallel single-photon synchronization for quantum repeater nodes and photonic quantum computing platforms.

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Esteban Gómez-López, Dominik Ritter, Jisoo Kim, Harald Kübler, Markus A. Schmidt, Oliver Benson. 2025-03-28. Light Storage in Light Cages: A Scalable Platform for Multiplexed Quantum Memories. https://doi.org/10.1038/s41377-025-02085-5

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