Testing Quantum Mechanics With Astronomical Observations
and I are currently developing an experiment that would test quantum mechanics and entanglement with the help of astronomical observations. Specifically, we are aiming to close one of the last remaining loopholes in tests of Bell's inequality that could allow a so-called local hidden variable theory to mimic the predictions of quantum mechanics. To do so, we would combine a standard Earth-based experiment (a so-called Bell test) with entangled photons, but use real-time astronomical observations of distant galaxies like quasars or patches of the cosmic microwave background, to essentially let the universe decide how to set up our experiment instead of using standard quantum random number generators, as in state of the art experiments, such as this one
. For popular level discussions of our project, see here
. Or see these technical level papers on our proposed Cosmic Bell experiment
and the required theoretical cosmology background
needed to chose pairs of cosmic sources whose past light cones have not intersected in the past 13.8 billion years, since the end of any early-universe inflation.