Time for us is a constant, relentlessly moving forward. The ticking of a clock on the wall, the steady march of seconds on a digital display — they’re such familiar concepts that we rarely stop to ...

Quantum timekeeping is supposed to be the ultimate in efficiency, with tiny devices that tick using the rules of quantum mechanics instead of swinging pendulums or vibrating quartz. Yet new work on a ...

Scientists built a tiny clock from single-electron jumps to probe the true energy cost of quantum timekeeping. They discovered that reading the clock’s output requires vastly more energy than the ...