New chip makes quantum sensors simpler to build

A new quantum magnetometer chip using 4H-silicon carbide achieves a sensitivity of, representing an improvement of two to three orders of magnitude over sensors built with more complex confocal techniques. The device uses industrially scalable wafer-scale fabrication, a departure from the manufacturing challenges of diamond-based quantum sensors. Integrating color center ensembles into a planar silicon carbide waveguide simplifies fluorescence extraction and streamlines optical excitation. The researchers report that this development “paves the way for the development of SiC-quantum sensing technologies.” Efficiently channeling the faint glow emitted by quantum sensors has long been a challenge, but a new design using a silicon carbide waveguide significantly simplifies fluorescence extraction. The planar structure, formed as a layered “sandwich” of doped silicon carbide, guides both excitation and fluorescence light from embedded V2 color centers with minimal loss across a broad spectrum from 780 to 1200 nanometers. This contrasts sharply with the complexities of standard confocal methods, which require precise alignment and collection optics. Fabrication of the chip relies on industrially scalable wafer-scale…