100 years of quantum physics: From 1920s theories to mind-bending computers of 2020

Back in the 1920s, quantum mechanics, which is the theory that underpins everything from how atoms behave to how quantum computers work, was well on the way to gaining mainstream acceptance. But one conundrum remained: Sometimes, quantum objects like electrons, atoms, and molecules behave like particles, and others they behave like waves. Sometimes they even behave like particles and waves at the same time. So, when studying these quantum objects, it has never been quite clear which approach scientists needed to use for their calculations. Sometimes, scientists needed to assume that the quantum objects were waves to get the correct…

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