Qubits, the fundamental component of every quantum computer, are currently very error-prone pieces of technology. What’s called fault-tolerant quantum computing could need 1,000 or more of such iffy “physical” qubits to yield just one potentially useful “logical” qubit. Now Microsoft and the quantum computing firm Quantinuum have announced a system that yields four logical qubits from just 30 physical qubits. Moreover, they say, these logical qubits display a record-setting 800-fold improvement in error rate compared with their component physical qubits.
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