Continuous dynamical decoupling magnetometry

TL;DR

This paper explores continuous dynamical decoupling as an alternative to pulsed methods for AC magnetometry, offering improved sensitivity and robustness under certain noise conditions.

Contribution

It demonstrates that continuous driving schemes can match frequency constraints and enhance sensitivity, with increased robustness to control errors compared to traditional pulsed techniques.

Findings

Continuous schemes provide similar frequency constraints as pulsed methods.

They offer improved sensitivity in specific noise regimes.

Enhanced robustness to driving errors and better adaptability.

Abstract

Solid-state qubits hold the promise to achieve unmatched combination of sensitivity and spatial resolution. To achieve their potential, the qubits need however to be shielded from the deleterious effects of the environment. While dynamical decoupling techniques can improve the coherence time, they impose a compromise between sensitivity and bandwidth, since to higher decoupling power correspond higher frequencies of the field to be measured. Moreover, the performance of pulse sequences is ultimately limited by control bounds and errors. Here we analyze a versatile alternative based on continuous driving. We find that continuous dynamical decoupling schemes can be used for AC magnetometry, providing similar frequency constraints on the AC field and improved sensitivity for some noise regimes. In addition, the exibility of phase and amplitude modulation could yield superior robustness to driving errors and a better adaptability to external experimental scenarios.