  We develop closed expressions for a time-resolved photon counting signal
induced by an entangled photon pair in an interferometric spectroscopy setup.
Superoperator expressions in Liouville-space are derived that can account for
relaxation and dephasing induced by coupling to a bath. Interferometric setups
mix matter and light variables non-trivially, which complicates their
interpretation. We provide an intuitive modular framework for this setup that
simplifies its description. Based on separation between the detection stage and
the light-matter interaction processes. We show that the pair entanglement time
and the interferometric time-variables control the observed physics time-scale.
Only a few processes contribute in the limiting case of small entanglement time
with respect to the sample response, and specific contributions can be singled
out.
