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" ... Believe it or not, the idea that space or time could be quantized goes back not to Einstein, but to Heisenberg. Heisenberg's famous uncertainty principle fundamentally limits how precisely certain pairs of quantities like position and momentum, energy and time, or angular momentum in two perpendicular directions can be precisely measured. If you tried to calculate certain physical quantities in quantum field theory, the expected value diverged, or went to infinity, which means they gave nonsense answers. ... "
" ... Quantum gravity tries to combine Einstein’s General theory of Relativity with quantum mechanics.... [+] Quantum corrections to classical gravity are visualized as loop diagrams, as the one shown here in white. Whether space (or time) itself is discrete or continuous is not yet decided, as is the question of whether gravity is quantized at all, whether there's a graviton (massive or massless). or whether particles, as we know them today, are fundamental or not. But if we hope for a fundamental theory of everything, it must include quantized fields, which General Relativity does not do on its own. ... "
" ... Quantum gravity tries to combine Einstein’s general theory of relativity with quantum mechanics.... [+] Quantum corrections to classical gravity are visualized as loop diagrams, as the one shown here in white. Whether space (or time) itself is discrete or continuous is not yet decided, as is the question of whether gravity is quantized at all. ... "
" ... The possibility is exciting and tantalizing, but we have to remember that taking the first step looks very different from drawing the ultimate goal-of-a-conclusion we’re all truly looking forward to. If we could demonstrate that gravity is inherently quantum in nature, that would be tremendous. If we could demonstrate that space is quantized, that would change how we view our reality. And if we could perform an experiment whose results disagreed with the straightforward predictions of General Relativity, that would spur us towards tremendous developments and new advances. ... "