  It has been shown that shared entanglement between two telescope sites can in
principle be used to localize a point source by mimicking the standard
phase-scanning interferometer, but without physically bringing the light from
the distant telescopes together. In this paper, we show that a receiver that
employs spatial-mode sorting at each telescope site, combined with pre-shared
entanglement and local quantum operations can be used to mimic the most general
multimode interferometer acting on light collected from the telescopes. As an
example application to a quantitative passive-imaging problem, we show that the
quantum-limited precision of estimating the angular separation between two
stars can be attained by an instantiation of the aforesaid entanglement based
receiver. We discuss how this entanglement assisted strategy can be used to
achieve the quantum-limited precision of any complex quantitative imaging task
involving any number of telescopes. We provide a blueprint of this general
receiver that involves quantum transduction of starlight into quantum memory
banks and spatial mode sorters deployed at each telescope site, and
measurements that include optical detection as well as qubit gates and
measurements on the quantum memories. We discuss the relative contributions of
local mode sorting at telescope sites vis-a-vis distributed
entanglement-assisted interferometry, to the overall quantum-limited
information about the scene, based on the ratio of the baseline distance to the
individual telescope diameter.
