Toby Cubitt

Google and IBM are at odds over 'quantum supremacy' – an expert explains what it really means

Google claims to have demonstrated something called “quantum supremacy”, in a paper published in Nature. This would mark a significant milestone in the development of a new type of computer, known as a quantum computer, that could perform very difficult calculations much faster than anything possible on conventional “classical” computers. But a team from IBM has published their own paper claiming they can reproduce the Google result on existing supercomputers.

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