A sapphire crystal weighing 16 micrograms is the largest object ever to exist in a quantum-mechanical superposition of two vibrational states.Matteo Fadel and his colleagues at the Swiss Federal Institute of Technology in Zurich (ETH Zurich) excited the crystal into vibrations such that its atoms oscillated back and forth simultaneously and in two opposite directionsputting the entire crystal in what is known as a state of quantum superposition.
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