General Relativity is a classical theory, Planck’s constant being zero within. Measurements are exact. Entanglement does not exist. GR ‘”must” contain a demonstrable flaw, prediction versus observation.
… Yeah, well,
…1) Physical reality is quantum mechanics (quantum field theory – QM plus special relativity) embedded within a Newtonian deterministic background (“uff da!”), or
…2) There is something very wrong with “wavefunction.” Either way,
…3) 60 years of “quantum gravitation,” millions of small print pages from huge numbers of the very smartest people pushed to their limits, sum to a nothingburger.
Quantum mechanics boldly predicts a real time chemistry output while disregarding its calculated 10–36,900/sec rate constant. That is -36,900 dex (bels, decades, orders of magnitude) saying “no” including 36,899 decimal places to the right. Somebody should look, because….the entire visible universe reduced to photons, neutrinos, electrons, and quarks only contains about 1097 particles.