This work was selected as an Editors’ Pick in the February 2026 issue of Chinese Optics Letters, as noted in Unitary Quantum’s official news report (April 9, 2026).
The study combines a Sagnac loop with off-axis parabolic mirrors to achieve achromatic UV–NIR waveguide coupling and polarization-preserving quantum frequency conversion from 369.5 nm to 580 nm. These wavelengths connect the optical transitions used by trapped-ion and solid-state quantum memory systems, providing an interface for heterogeneous quantum networks.
Related coverage: A quantum bridge across wavelength bands (in Chinese). The report describes the achromatic coupling scheme and its role in connecting trapped-ion nodes with solid-state quantum memories.
Paper link: Chinese Optics Letters 24, 021901 (2026)