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Solid-state single-quantum emitters are a crucial resource for on-chipphotonic quantum technologies and require efficient cavity-emitter coupling torealize quantum networks beyond the single-node level. Previous approaches toenhance light-matter interactions rely on forming nanocavities around randomlylocated quantum dots or color centers but lack spatial control of the quantumemitter itself that is required for scaling. Here we demonstrate adeterministic approach to achieve Purcell-enhancement at lithographicallydefined locations using the sharp corner of a metal nanocube for both electricfield enhancement and to deform a two-dimensional material. For a 3 by 4 arrayof strain-induced exciton quantum emitters formed into monolayer WSe2 we showspontaneous emission rate enhancement with Purcell-factors (FP) up to FP=1050(average FP=272), single-photon purification, and cavity-enhanced quantumyields increasing from initially 1 % to 15 %. The utility of our nanoplasmonicplatform is applicable to other 2D material, including boron nitride, openingnew inroads in quantum photonics.

Deterministic coupling of site-controlled quantum emitters in monolayer semiconductors to plasmonic nanocavities