Research and development progress toward DEMETER & CUPID-1T

CUORE is an ongoing neutrinoless double-beta decay search using the isotope ¹³⁰Te. The next generation detector, CUORE with Upgraded Particle IDentification (CUPID), will use scintillation light from Li₂¹⁰⁰MoO₄ cryogenic calorimeters to tag particles by their heat-to-light signal ratio. CUPID is under development at the 250 kg level, but is looking to the next stage with 1 tonne of ¹⁰⁰Mo (CUPID-1T). Scaling the next generation of crystalline detectors to this size requires ten thousand channels or more, as well as advancements in pileup discrimination and background reduction; R&D efforts underway towards this goal are discussed. We specifically discuss the DEMETER project, a collaboration between UC Berkeley and Lawrence Berkeley National Laboratory toward implementation of a multiplexed readout and event discrimination at the single-crystal level.