  Electrically tunable graphene plasmons are anticipated to enable strong
light-matter interactions with resonant quantum emitters. However, plasmon
resonances in graphene are typically limited to infrared frequencies, below
those of optical excitations in robust quantum light sources and many
biologically interesting molecules. Here we propose to utilize near fields
generated by the plasmon-assisted nonlinear optical response of nanostructured
graphene to resonantly couple with proximal quantum emitters operating in the
near-infrared. We show that the nonlinear near-field produced by a graphene
nanodisk can strongly excite and coherently control quantum states in two- and
three-level atomic systems when the third harmonic of its plasmon resonance is
tuned to a particular electronic transition. In the present scheme, emitter and
plasmon resonances are nondegenerate, circumventing strong enhancement of
spontaneous emission. We envision potential applications for the proposed
nonlinear plasmonic coupling scheme in sensing and temporal quantum control.
