Quantum physics rules the microscopic world, while classical physics reigns over the macroscopic realm. Power changes hands somewhere in between but exactly how and at what scale is still unknown. A new experiment with an acoustic resonator demonstrates quantum superposition—the simultaneous occupation of two distinct states—in a collection of 1016 atoms, weighing around 1 microgram . The results push the boundary of “quantumness” in near-macroscopic objects, and further refinements could allow these resonators to surpass quantum tests with matter interferometers.
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