Random access and high dimensional integrated quantum memory

Abstract:Random-access quantum memory (RAQM) is a fundamental building block for scalable quantum networks and photonic quantum computing. While existing realizations rely on gaseous physical systems, solid-state platforms--particularly integrated architectures--offer distinct practical advantages for scalable deployment. However, current integrated quantum memories are limited to single-channel operation, which precludes both RAQM and the manipulation of high-dimensional photonic states. Here, we demonstrate an 11-channel integrated quantum memory based on laser-written waveguide arrays in an $^{151}$Eu$^{3+}$:Y$_2$SiO$_5$ crystals. On-chip electrode arrays allow independent control of the read-out time in each channel via Stark-shift-induced atomic interference. The device achieves random-access quantum storage of three time-bin qubits with a fidelity exceeding 99%, and stores five-dimensional path-encoded quantum states with a fidelity above 96%. This multichannel integrated quantum memory supports flexible functionality through its random-access operation and establishes a practical hardware platform for high-dimensional quantum networks implemented in integrated architectures.

arXiv:2508.19605 [quant-ph]

(or arXiv:2508.19605v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2508.19605 Focus to learn more arXiv-issued DOI via DataCite

Ou, ZW., Zhu, TX., Liang, PJ. et al. Random access and high dimensional integrated quantum memory. PhotoniX 7, 60 (2026)

https://doi.org/10.1186/s43074-026-00284-w Focus to learn more DOI(s) linking to related resources

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