# Environmentally mediated coherent control of a spin qubit in diamond

## TL;DR

This paper introduces environmentally mediated resonance (EMR), a novel method for controlling a diamond NV center spin qubit via nearby environmental spins, enabling nanoscale environment probing and coherent control.

## Contribution

The paper presents the first experimental demonstration of EMR, a new technique for qubit control through environment spins, expanding quantum control methods.

## Key findings

- Successful demonstration of EMR-driven Rabi oscillations
- Observation of free induction decay and spin-echo signals
- Nanoscale ESR spectra acquisition of single NV centers

## Abstract

The coherent control of spin qubits forms the basis of many applications in quantum information processing and nanoscale sensing, imaging and spectroscopy. Such control is conventionally achieved by direct driving of the qubit transition with a resonant global field, typically at microwave frequencies. Here we introduce an approach that relies on the resonant driving of nearby environment spins, whose localised magnetic field in turn drives the qubit when the environmental spin Rabi frequency matches the qubit resonance. This concept of environmentally mediated resonance (EMR) is explored experimentally using a qubit based on a single nitrogen-vacancy (NV) centre in diamond, with nearby electronic spins serving as the environmental mediators. We demonstrate EMR driven coherent control of the NV spin-state, including the observation of Rabi oscillations, free induction decay, and spin-echo. This technique also provides a way to probe the nanoscale environment of spin qubits, which we illustrate by acquisition of electron spin resonance spectra of single NV centres in various settings.