Marking the passage of time in a world of ticking clocks and swinging pendulums is a simple case of counting the seconds between 'then' and 'now'.
. Needless to say, physicists have amassed a significant amount of information about the way electrons move about when nudged into a Rydberg state.
Just like actual waves in a pond, having more than one Rydberg wave packet rippling about in a space creates interference, resulting in unique patterns of ripples. Throw enough Rydberg wave packets into the same atomic pond, and those unique patterns will each represent the distinct time it takes for the wave packets to evolve in accordance with one another.
"If you're using a counter, you have to define zero. You start counting at some point," physicist Marta Berholts from the University of Uppsala in Sweden, who led the team, explained to"The benefit of this is that you don't have to start the clock – you just look at the interference structure and say 'okay, it's been 4 nanoseconds.'"
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