Physicists Achieve Heaviest 'Schrödinger Cat' in Quantum Record.
Physicists at the Swiss Federal Institute of Technology (ETH) Zurich have set a new quantum record by creating the heaviest object ever to be recorded in a superposition of locations. They coupled a mechanical resonator to a type of superconducting circuit commonly used in quantum computing to effectively replicate Erwin Schrödinger's famous thought experiment on an unprecedented scale. The experiment used a high-overtone bulk acoustic-wave resonator, or HBAR, which served as a 16.2 microgram cat. The team used a transmon, a superconducting circuit that served as the experiment's power source, sensor, and superposition.