Detection and control of individual nuclear spins using a weakly coupled electron spin

TL;DR

This paper demonstrates a method to isolate, characterize, and coherently control individual nuclear spins weakly coupled to an electron spin in diamond, enabling advanced quantum information processing.

Contribution

The authors introduce a multi-pulse sequence technique that amplifies specific nuclear spin interactions while suppressing decoherence, allowing control of spins with very weak coupling.

Findings

Controlled up to six nuclear spins in diamond.

Addressed spins with interaction strengths much smaller than electron spin dephasing rate.

Extended the number of usable quantum bits in diamond for quantum computing.

Abstract

We experimentally isolate, characterize and coherently control up to six individual nuclear spins that are weakly coupled to an electron spin in diamond. Our method employs multi-pulse sequences on the electron spin that resonantly amplify the interaction with a selected nuclear spin and at the same time dynamically suppress decoherence caused by the rest of the spin bath. We are able to address nuclear spins with interaction strengths that are an order of magnitude smaller than the electron spin dephasing rate. Our results provide a route towards tomography with single-nuclear-spin sensitivity and greatly extend the number of available quantum bits for quantum information processing in diamond.