Although the problem they attacked uses a much-simplified, unrealistic model of a material, “It makes you optimistic that this will work in other systems and more complicated algorithms,” says physicist John Martinis.
. IBM’s approach — which is also used by Google and other companies — encodes each qubit in a tiny superconducting circuit. For quantum computers to be effective, the qubits have to keep their quantum state for long enough for a calculation to be carried out. So a crucial engineering effort went into increasing the lifetime of the qubits, the IBM team says.
Some researchers are less optimistic about the potential of noise mitigation, and expect that only quantum error correction will enable calculations that would be impossible on even the largest classical supercomputersThe Eagle has 127 qubits — but IBM expects to unveil its most powerful processor yet, the 1,121-qubit Condor chip, later this year.
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