  The coherence between quantum states with different particle numbers --- the
Fock-space coherence --- qualitatively differs from the more common
Hilbert-space coherence between states with equal particle numbers. For a
quantum dot with multiple channels available for transport, we find the
conditions for decoupling the dynamics of the Fock-space coherence from both
the Hilbert-space coherence as well as the population dynamics. We further find
specific energy and coupling regimes where a long-lived resonance in the
Fock-space coherence of the system is realized, even where no resonances are
found either in the populations or Hilbert-space coherence. Numerical
calculations show this resonance remains robust in the presence of both
boson-mediated relaxation and transport through the quantum dot.
