  On-demand emission of individual electrons for the implementation of flying
qubits and quantum electron-optics experiments requires precise knowledge and
tunability of emission times and energies. Crucially, for confined electron
sources such as driven quantum dots, the effect of local Coulomb interaction on
these emission properties needs to be understood, in particular if multiple
particles are emitted close in time or near-simultaneously. This paper
theoretically analyzes electron-pair emission from an ac driven quantum dot,
detailing the competing effects of the electron-electron interaction, the
time-dependent potential forming the quantum dot, and of the quantum-state
properties such as degeneracy on the emission times and energies. We complement
a numerical analysis of the coherent Schr\"odinger evolution of two particles
in a driven potential with a master-equation description for strongly
interacting electrons tunneling stochastically into a weakly coupled conductor.
This captures a broad range of different influences on the emitted particles
and thereby guides the development of single-electron sources higher control
over two-particle emission properties.
