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Quantum gravity gets a new test
A proposed experiment could bring scientists closer to answering the long-standing question of whether gravity is a classical or a quantum phenomenon.
Their oscillations are monitored by shining light (red) from a laser (blue) into optical cavities—formed by the pendulums’ ends and fixed mirrors (orange)—and then into detectors (gray). In those experiments, two widely separated, heavy objects are placed in highly delocalized quantum states, meaning that their wave functions are spread out over a large volume of space. Andrea Mari and David Vitali, two quantum physicists at the University of Camerino, Italy, think that the suggested approach is a promising alternative to the more conventional, entanglement-based protocols and is, in principle, feasible with existing or near-future technology.
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