# Initialization and Readout of Nuclear Spins via negatively charged Silicon-Vacancy Center in Diamond

## TL;DR

This paper demonstrates the initialization and readout of nuclear spins using a negatively charged silicon-vacancy center in diamond, advancing quantum hardware with efficient spin-photon interfaces and long-lived nuclear memory.

## Contribution

It introduces a method for nuclear spin initialization and readout via SiV centers, showing coherent transfer and long coherence times, which are novel in this context.

## Key findings

- Nuclear spins can be initialized and read out via SiV centers.
- Coherence time of nuclear spins reaches 6 ms.
- Electron spin polarization is transferred to nuclear spins under Hartmann-Hahn conditions.

## Abstract

In this work, we demonstrate initialization and readout of nuclear spins via a negatively charged silicon-vacancy (SiV) electron spin qubit. Under Hartmann-Hahn conditions the electron spin polarization is coherently transferred to the nuclear spin. The readout of the nuclear polarization is observed via the fluorescence of the SiV. We also show that the coherence time of the nuclear spin (6 ms) is limited by the electron spin-lattice relaxation due to the hyperfine coupling to the electron spin. This work paves the way towards realization of building blocks of quantum hardware with an efficient spin-photon interface based on the SiV color center coupled to a long lasting nuclear memory.