Cross-sensor feedback stabilization of an emulated quantum spin gyroscope

TL;DR

This paper presents a novel integrated quantum spin sensor that uses dual sensitivities to stabilize and improve the long-term stability of rotation sensing, outperforming comparable MEMS gyroscopes.

Contribution

The authors demonstrate a cross-sensor feedback stabilization method using NV center spins to enhance quantum gyroscope stability over extended periods.

Findings

Achieved stable rotation sensing for several hours.

Demonstrated better stability than MEMS gyroscopes of similar size.

Utilized local magnetic field fluctuations for real-time stabilization.

Abstract

Quantum sensors, such as the Nitrogen Vacancy (NV) color center in diamond, are known for their exquisite sensitivity, but their performance over time are subject to degradation by environmental noise. To improve the long-term robustness of a quantum sensor, here we realize an integrated combinatorial spin sensor in the same micrometer-scale footprint, which exploits two different spin sensitivities to distinct physical quantities to stabilize one spin sensor with local information collected in realtime via the second sensor. We show that we can use the electronic spins of a large ensemble of NV centers as sensors of the local magnetic field fluctuations, affecting both spin sensors, in order to stabilize the output signal of interleaved Ramsey sequences performed on the 14N nuclear spin. An envisioned application of such a device is to sense rotation rates with a stability of several days, allowing navigation with limited or no requirement of geo-localization. Our results would enable stable rotation sensing for over several hours, which already reflects better performance than MEMS gyroscopes of comparable sensitivity and size.