(Physics.org) Simon Gröblacher, of Delft University of Technology in the Netherlands, and colleagues have pushed the boundaries of quantum weirdness to macroscopic scales. They demonstrated quantum entanglement and violations of Bell’s inequality—a canonical test of the principle that all influences on a particle are local and that particle states exist independently of the observer. They used two mechanical resonators, each containing roughly 10 billion atoms.
The team hopes to test quantum mechanics on an even larger scale by creating more complex quantum states of optomechanical systems. Also, by improving the lifetime of the mechanical excitations of the resonators—currently limited to just a few microseconds—the team says that this setup could operate as a memory node in a quantum network.