Nuclear spins of noble-gas atoms are exceptionally isolated from the environment and can maintain their quantum properties for hours at room temperature. Here we develop a mechanism for entangling two such distant macroscopic ensembles by using coherent light input. The interaction between the light and the noble-gas spins in each ensemble is mediated by spin-exchange collisions with alkali-metal spins, which are only virtually excited. The relevant conditions for experimental realizations with ^{3}\text{He} or ^{129}\text{Xe} are outlined.
@article{arxiv.2002.07030,
title = {Long-lived entanglement generation of nuclear spins using coherent light},
author = {Or Katz and Roy Shaham and Eugene S. Polzik and Ofer Firstenberg},
journal= {arXiv preprint arXiv:2002.07030},
year = {2020}
}