‘Searching for a needle in a haystack;’ A Ba-tagging approach for an upgraded nEXO experiment

nEXO is a proposed experiment that will search for neutrinoless double-beta decay (0$\nu\beta\beta$) in 5-tonnes of liquid xenon (LXe), isotopically enriched $^{136}$Xe. A technique called Ba-tagging being developed as potential future upgrade to detect the $^{136}$Xe daughter isotope, $^{136}$Ba. An efficient has boost nEXO's 0$\nu\beta\beta$ sensitivity by essentially suppressing non-double-beta background events. conceptual approach extraction from detector volume, trapping, and identification single Ba ion 5 tonnes LXe presented, along with initial results commissioning one its subsystems, quadrupole mass filter.