Google physicists have demonstrated that making their quantum code bigger can reduce the error rate of calculations.
Although using multiple qubits for quantum error correction is beneficial in that it scales, adding additional qubits boosts the chances of multiple qubits being affected by simultaneous errors.
The researchers addressed this by using two versions of a quantum error-correction procedure, one using 17 qubits that could recover from one error at a time, and another using 49 qubits that could recover from two simultaneous errors.
Google’s Hartmut Neven acknowledged this latest innovation has served to bring down the error rate “a little,” adding, “we need it to come down a lot.”
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