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by ziofill
776 days ago
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Physicist here. It highly depends on a bunch of factors (the type of qubits, the error correcting code, the error rate, the algorithm…), but a ballpark number for practical usefulness is 1 million physical qubits. Keep in mind that qubit requirements keep tumbling down as people work hard to squeeze out as much as possible from a limited number of qubits. |
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