ALFRED PASIEKA/SCIENCE PHOTO LIBRARY
Google is racing to create the first quantum computer capable of solving a problem ordinary computers cannot – and it has just made that challenge much harder.
Achieving “quantum supremacy”, as it is known, involves building a device that can solve a problem faster than any non-quantum computer.
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In 2016, a team led by Sergio Boixo at Google published a paper showing that even with state-of-the-art supercomputers, it would be infeasible to simulate the behaviour of a quantum circuit with 48 qubits (quantum bits) at a circuit depth …