# Steady state preparation of long-lived nuclear spin singlet pair at room temperature

## TL;DR

This paper proposes a room-temperature, dissipative method to reliably generate long-lived nuclear spin singlet pairs using NV centers, enhancing quantum memory and sensing applications.

## Contribution

It introduces a novel dissipative protocol combining NV center electron spins and RF control for robust singlet state preparation at room temperature.

## Key findings

- High-fidelity singlet pair generation demonstrated in 13C dimers
- Protocol is robust to external magnetic field fluctuations
- Feasible under realistic experimental conditions

## Abstract

The coherent high-fidelity generation of nuclear spins in long-lived singlet states which may find application as quantum memory or sensor represents a considerable experimental challenge. Here we propose a dissipative scheme that achieves the preparation of pairs of nuclear spins in long-lived singlet states by a protocol that combines the interaction between the nuclei and a periodically reset electron spin of an NV center with local rf-control of the nuclear spins. The final state of this protocol is independent of the initial preparation of the nuclei, is robust to external field fluctuations and can be operated at room temperature. We show that a high fidelity singlet pair of a 13C dimer in a nuclear bath in diamond can be generated under realistic experimental conditions.