Cosmological perturbations are sourced by quantum fluctuations of the
vacuum during inflation. In contrast, our observations of the Cosmic
Microwave Background are classical. Can we test for the quantum
origins of the perturbations? How much quantum information is lost
when we make these observations? Have we totally screwed up by
building PLANCK, and measured the correlations in the wrong basis and
hence losing the primordial quantum information for good? I will talk
about all these!