Quantum supremacy is a term that refers to the ability of a quantum computer to solve a problem that is beyond the reach of even the most powerful classical computers. It is considered a milestone in the development of quantum computing because it demonstrates the potential of quantum computers to perform tasks that are not possible with classical computers.

In order to achieve quantum supremacy, a quantum computer must perform a specific task faster than any classical computer. This requires a large number of qubits capable of maintaining their quantum state for a sufficiently long time to perform the necessary calculations. The task must also be carefully designed to take advantage of the quantum computer's unique capabilities.

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