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Efficient integrated quantum memory for light
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DOI：10.1038/s41566-026-01845-y.png)
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Abstract
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Scalable implementation of quantum networks and photonic processors demands 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-ion-doped crystals coupled with impedance-matched microcavities, realized in two novel architectures: 200-μm-thin membranes of Eu3+:Y2SiO5 integrated with fibre-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. Integrated quantum memories based on 151Eu3+:Y2SiO5 crystals coupled with impedance-matched optical cavities are demonstrated. Multiplexed quantum storage efficiencies of 80.3% and 69.8% are achieved for weak coherent pulses and telecom-heralded single photons, respectively.
Keywords:
Micro-optics
Quantum information
Quantum optics
Physics
general
Applied and Technical Physics
Quantum Physics
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32.9
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4.3K
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6.1W
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Cited Papers
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