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Physics

What exactly would a full-scale quantum computer be useful for?

As quantum computers mature, they will be transformational. But there are good reasons why we don’t yet know exactly which problems they will excel at – and that makes them all the more exciting

By Karmela Padavic-Callaghan

16 April 2025

ÐÔÊӽ紫ý. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

Quantum physics gets a bad rap. The behaviour of the atoms and particles it describes is often said to be weird, and that weirdness has given rise to all manner of esoteric notions – that we live in a multiverse, say, or that the reality we see isn’t real at all. As a result, we often overlook the fact that quantum physics has had a real effect on our lives: every time you glance at your smartphone, for instance, you are benefiting from quantum phenomena.

But the story of what quantum theory is good for doesn’t end there. As our mastery…

Article amended on 17 April 2025

We clarified how many bits would be required to store any number between 0 and 1023.

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