Quantum computers aren’t currently reliable enough for mainstream use, in part because the error rates of their calculations are too high. That could soon change, because for the first time, a quantum computer has demonstrated an error-correction strategy that fixes more errors than it creates, which may provide a practical way to scale up to a machine capable of carrying out genuinely useful computations.
Ordinary computers store data as either a 0 or 1, but errors can cause the bit to “flip” to the wrong value, …
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