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Researchers at Universidad Politécnica de Cartagena have transitioned an NV-center magnetometer from a stable frequency-locked state into a self-sustained oscillator by deliberately inducing dynamical instability. By increasing the software loop gain to cross a bifurcation threshold, the team demonstrated that internal feedback can generate continuous signals without external stimuli, marking a significant step toward autonomous quantum sensing architectures. This work highlights how pushing precision instruments beyond their standard operating limits reveals critical fluctuations essential for next-generation measurement devices.

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Cartagena Engineers Quantum Measure Critical Point for Self-Sustained Magnetometer

Quantum ZeitgeistAugust 1, 20265 min read

Researchers at the Universidad Politécnica de Cartagena achieved a critical point for a self-sustained magnetometer, using a quantum measure of its feedback loop gain.

Researchers at the Universidad Politécnica de Cartagena have moved beyond standard precision sensing by deliberately inducing instability in a nitrogen-vacancy (NV) ensemble magnetometer. The team drove the frequency-modulation (FM) locked magnetometer through a bifurcation by raising the software loop gain, transforming it into a self-sustained oscillator. This shift means the magnetometer’s internal feedback loop generates a continuous signal, rather than relying on an external stimulus. The work identifies a measurable threshold linked to the ratio of the magnetometer’s transduction slope at calibration to its present value, and reports measurements showing sub-threshold critical fluctuations aligning with predicted divergence. Researchers…

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