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Googles paper demonstrates how larger quantum computers can manage noise interference that threatens to disrupt the fragile states in which qubits operate to continue to make calculations.

The researchers said: We conclude that our demonstration is firmly in the regime of beyond-classical quantum computation.

The rival machines were measured on a randomisation task that critics say favour quantum computers and lack any practical value beyond academic study.

Steve Brierley, the chief executive of Cambridge-based quantum company Riverlane, said: This is a major milestone. The squabbling about whether we had reached, or indeed could reach, quantum supremacy is now resolved.

Sebastian Weidt, the chief executive of Brighton-based start-up Universal Quantum, said quantum computers needed to demonstrate more practical functions.

He said: This is a very nice demonstration of quantum advantage. While a great achievement academically, the algorithm used does not really have real world practical applications though.

We really must get to utility quantum computing an era where quantum computers with many thousand qubits actually begin to deliver value to society in a way that classical computers never will be able to.

Read more:
Google quantum computer instantly makes calculations that take rivals 47 years - The Telegraph