Resolving Remoter Nuclear Spins in a Noisy Bath by Dynamical Decoupling Design

TL;DR

This paper demonstrates a novel dynamical decoupling technique that enhances the resolution of weakly coupled nuclear spins in diamond, enabling detection of more remote spins and continuous tuning of the detection field.

Contribution

The authors introduce a new dynamical decoupling control method that reveals previously hidden nuclear spins and extends nanoscale magnetometry capabilities.

Findings

Resolved multiple weakly coupled nuclear spins

Shifted hidden signals into coherence time range

Enabled continuous tuning of detection field

Abstract

We experimentally resolve several weakly coupled nuclear spins in diamond using a series of novelly designed dynamical decoupling controls. Some nuclear spin signals, hidden by decoherence under ordinary dynamical decoupling controls, are shifted forward in time domain to the coherence time range and thus rescued from the fate of being submerged by the noisy spin bath. In this way, more and remoter single nuclear spins are resolved. Additionally, the field of detection can be continuously tuned on sub-nanoscale. This method extends the capacity of nanoscale magnetometry and may be applicable in other systems for high-resolution noise spectroscopy.