It isn’t supposed to be possible, but a research team at the University of California Berkeley think they’ve discovered a way to create a device that could exist through time past the heat death at the end of the universe.
Similar to the fabled but impossible perpetual motion machine, the device would require no input because it would exist in the lowest possible quantum energy state.
At the moment, this device is a mere theoretical concept, but Xiang Zhang and his team at Lawrence Berkeley National Laboratory have proposed an ion trap held in a weak static magnetic field. The resulting ring-shaped ion crystal would move in an unending rotation and be capable of measuring time.
Sadly, no one will be around to check whether it’s still working or not by then.