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Determining the passage of time in our world of ticking clocks and oscillating pendulums is a simple case of counting the seconds between 'then' and 'now'.
Their experiments on the wave-like nature of something called a Rydberg state revealed a novel way to measure time that doesn't require a precise starting point.are the over-inflated balloons of the particle kingdom. Puffed up with lasers instead of air, these atoms contain electrons in extremely high energy states, orbiting far from the nucleus.
Being quantum animals, though, their movements are less like beads sliding about on a tiny abacus, and more like an evening at the roulette table, where every roll and jump of the ball is squeezed into a single game of chance. 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.
Their research involved measuring the results of laser-excited helium atoms and matching their findings with theoretical predictions to show how their signature results could stand in for a duration of time. A guidebook of evolving Rydberg wave packets could be used in combination with other forms of pump-probe spectroscopy that measure events on a tiny scale, when now and then are less clear, or simply too inconvenient to measure.
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