  In this work, we show that by combining quantum metrology and networking
tools, it is possible to extend the baseline of an interferometric optical
telescope and thus improve diffraction-limited imaging of point source
positions. The quantum interferometer is based on single-photon sources, linear
optical circuits, and efficient photon number counters. Surprisingly, with
thermal (stellar) sources of low photon number per mode and high transmission
losses across the baseline, the detected photon probability distribution still
retains a large amount of Fisher information about the source position,
allowing for a significant improvement in the resolution of positioning point
sources, on the order of 10 {\mu}as. Our proposal can be implemented with
current technology. In particular, our proposal does not require experimental
optical quantum memories.
