There is a proposal for an experiment to decide whether general relativity is not correct at the quantum level. This opens a window to understand which way towards a theory of quantum gravity might be chosen.
Prof Vlatko Vedral Vlatko Vedral, Professor of Quantum Information Theory WP: Vlatko Vedral Chiara Marletto - Wolfson College Chiara Marletto Constructor Theory WP: Chiara Marletto Gravitationally-induced entanglement between two massive particles is sufficient evidence of quantum effects in gravity