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am less convinced that ‘time spent by a quantum object within the barrier region’ is an entirely meaningful concept representing any objective reality,” writes Litvinyuk. This debate over whether reality can be accurately observed is broadly known as the “measurement problem” of quantum mechanics, and it has led to many interpretations of quantum mechanics, including one idea in which the universe splits into parallel branches every time someone makes a measurement.

With the Larmor and the attoclock experiments, physicists now have two very different techniques to measure tunneling time. While neither experiment resolves the question of how long tunneling takes, analyzing and comparing the two different systems will help physicists get closer to the truth, says Landsman. “I think these experiments will stimulate a lot more research in this area,” she says. Alien as they sound, such quantum tests p