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arXiv · 2511.05928

Efficient integrated quantum memory for light

Ruo-Ran Meng·Pei-Xi Liu·Xiao Liu·Tian-Xiang Zhu·Peng-Jun Liang·Chao Zhang·Zhong-Yang Tang·Hong-Zhe Zhang·Jin-Ming Cui·Ming Jin·Zong-Quan Zhou·Chuan-Feng Li·Guang-Can Guo
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Abstract

Scalable implementation of quantum networks and photonic processors require integrated photonic memories with high efficiency, yet current integrated systems have been limited to storage efficiencies below 27.8%. Here, we demonstrate highly efficient integrated quantum memories based on rare-earth-iondoped crystals coupled with impedance-matched microcavities, realized in two novel architectures: 200-micrometer-thin membranes of Eu3+:Y2SiO5 integrated with fiber-based microcavities, and waveguide-based cavities fabricated using femtosecond lasers. Our approach achieves reliable integrated quantum storage with record efficiencies of 80.3(7)% for weak coherent pulses and 69.8(1.6)% for telecom-heralded single photons, alongside the storage of 20 temporal modes with an average efficiency of 51.3(2)%. Moreover, the thin-membrane Eu3+:Y2SiO5 architecture enables spectrally tunable efficient quantum storage via variable strain, providing a flexible interface for quantum networks. By combining high efficiency, large multimode capacity, and tunability, our devices establish a versatile hardware foundation for scalable quantum repeaters and chip-scale photonic processors.

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Ruo-Ran Meng, Pei-Xi Liu, Xiao Liu, Tian-Xiang Zhu, Peng-Jun Liang, Chao Zhang, Zhong-Yang Tang, Hong-Zhe Zhang, Jin-Ming Cui, Ming Jin, Zong-Quan Zhou, Chuan-Feng Li, Guang-Can Guo. 2025-11-08. Efficient integrated quantum memory for light. https://doi.org/10.1038/s41566-026-01845-y

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