Researchers demonstrate for the first time that using more qubits can lower error rate of quantum calculations.
Error correction is an inescapable requirement if quantum computers are to fulfil their promise of solving problems that are beyond the reach of classical machines — such as factoring large whole numbers into primes, or understanding the detailed behaviour of chemical catalysts.
“In quantum information we can’t do that,” said Julian Kelly, Google’s director of quantum hardware, at the press briefing. Quantum computers are based on quantum states called qubits, which can exist in a mixture of ‘0’ and ‘1’ states. A qubit cannot be read out without its full quantum state being irretrievably lost, which means that its information cannot be simply copied onto redundant qubits.
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