An ultra-precise clock that ticks to the beat of hydrogen molecules could probe fundamental constants and maybe spot signs of new physics.
Atomic clocks are the world's most accurate timekeepers. They measure the frequency of radiation that makes an atom's electrons jump from one energy level to another. This never changes for a given element, so a number of cycles of this radiation can define the second.
The clocks don't just keep time. They have a range of applications from simulating quantum systems to measuring gravity. But current clocks are reaching limits when it comes to the precision needed to probe some mysteries.
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