Proof of the usefulness of a quantum computer. Quantum supremacy means that a quantum computer is capable of solving a problem that a classical computer would take forever to resolve. For example, in 2019, Google claimed its Sycamore quantum computer solved a mathematical problem in three minutes that would take a supercomputer 10,000 years.

**Not So Fast**

This quantum supremacy claim has been refuted by IBM and others, stating that it would only take a few weeks of classical computation. In addition, the problem that was solved was considered irrelevant for all practical purposes. See quantum computing.

This quantum supremacy claim has been refuted by IBM and others, stating that it would only take a few weeks of classical computation. In addition, the problem that was solved was considered irrelevant for all practical purposes. See quantum computing.

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