Integrated quantum memories fabricated with fs-laser micromachining, FIB, etc.

References:

Reliable coherent optical memory based on a laser-written waveguide. Optica 7,192 (2020)

Coherent Optical Memory Based on a Laser-Written On-Chip Waveguide. Phys. Rev. Applied 14, 054071 (2020)

On-Demand Quantum Storage of Photonic Qubits in an On-Chip Waveguide. Phys. Rev. Lett. 125, 260504 (2020)

On-Demand Integrated Quantum Memory for Polarization Qubits. Phys. Rev. Lett. 128, 180501 (2022) 

On-demand multimode optical storage in a laser-written on-chip waveguide. Phys. Rev. A 105, 052432 (2022)

Photonic Integrated Quantum Memory in Rare-Earth Doped Solids. Laser & Photonics Reviews 17, 2300257 (2023) [Review Article]

Solid-state quantum nodes based on color centers and rare-earth ions coupled with fiber Fabry-Pérot microcavities. Chip 3, 100081 (2024) [Review Article]

Integrated spin-wave quantum memory. National Science Review nwae161 (2024)