  Highly integrated single photon sources are key components in future
quantum-optical circuits. Whereas the probabilistic generation of single
photons can routinely be done by now, their triggered generation is a much
greater challenge. Here, we describe the triggered generation of single photons
in a hybrid plasmonic device. It consists of a lambda-type quantum emitter
coupled to a multimode optical nanoantenna. For moderate interaction strengths
between the subsystems, the description of the quantum optical evolution can be
simplified by an adiabatic elimination of the electromagnetic fields of the
nanoantenna modes. This leads to an insightful analysis of the emitter's
dynamics, entails the opportunity to understand the physics of the device, and
to identify parameter regimes for a desired operation. Even though the approach
presented in this work is general, we consider a simple exemplary design of a
plasmonic nanoantenna, made of two silver nanorods, suitable for triggered
generation of single photons.
