Quantum computers are computers that exploit the weird properties of matter at extremely small scales. Where a bit in a classical computer can represent either a "1" or a "0," a quantum bit, or qubit, can represent "1" and "0" simultaneously. Computations performed on a string of qubits are thus the equivalent of computations performed on every possible value of a string of ordinary bits. Since eight classical bits can represent 256 different values, a single eight-qubit calculation is the equivalent of 256 classical calculations.Quantum computing may actually be useful, after all
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