Scientists observe how quantum superpositions build up in a helium atom within femtoseconds

In the double slit experiment, a particle travels on two different paths at the same time. Something similar can be observed when a helium atom is ionized with a laser beam. The ionization of helium can happen via two different processes, and this leads to characteristic interference effects. A team of scientists has now managed to observe the buildup up of these effects—even though this effect takes place on a time scale of femtoseconds.

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