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I propose an experiment that may be performed, with present low temperatureand cryogenic technology, to reveal Wheeler's quantum foam. It involvescoupling an optical photon's momentum to the center of mass motion of amacroscopic transparent block with parameters such that the latter is displacedin space by approximately a Planck length. I argue that such displacement issensitive to quantum foam and will react back on the photon's probability oftransiting the block. This might allow determination of the precise scale atwhich quantum fluctuations of space-time become large, and so differentiatebetween the brane-world and the traditional scenarios of spacetime.

Can quantum gravity be exposed in the laboratory?: A tabletop experiment to reveal the quantum foam