Abstract: A consistent theory that describes the quantum field mechanics of the gravitational interaction, called a `theory of quantum gravity', is among the most pursued goals in fundamental physics. Many formal advances have been made, along multiple paths. But the final goal remains as an unrealised quest and a conceptual enigma.  A crucial reason for not finding a clear path to quantum gravity is the lack of any experimental clue, direct or indirect. This contrasts starkly with the manner in which copious phenomenological signatures, especially the quantization of the radiation sector as observable “quanta”, had guided us to the theory of quantum electrodynamics.  After briefly reviewing some past proposals with a flavour of experimental access to quantum gravitational phenomena, I will discuss some relevant ideas that we have explored. Then I will I present a direct experimental test that decisively refutes the widely believed hypothesis of quantum gravity.

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