  We consider the prospects for observing the effects of quantum decoherence in
high-energy (TeV-PeV) neutrinos from astrophysical sources. In particular, we
study Galactic sources of electron anti-neutrinos produced in the decay of
ultra-high energy neutrons. We find that next generation neutrino telescopes
should be capable of placing limits on quantum decoherence effects over
multi-kiloparsec baselines, surpassing current bounds by a factor of $10^{12}$
to $10^{33}$, depending on the model considered.
