As precision quantum sensors become ubiquitous, it is natural to combine them into networks.
I will focus on searches for exotic physics signals with networks of quantum sensors. Most of my work
is related to atomic clocks and I will give a general introduction to atomic clocks. Then I will describe our search for clumpy dark
matter using 20 years of archival atomic clock data from GPS satellites. In the second part, I will cover searches for wavy and stochastic
ultralight dark matter. Finally, I will present our proposal for a search for exotic physics signals correlated with LIGO-detected gravitational
waves, which may provide the first experimental signature of quantum gravity in black-hole mergers.