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The four join Microsoft and PsiQuantum in Stage C, where government evaluators test whether a proposed utility-scale machine can be built as designed. Of the four, only Diraq disclosed its initial funding, $51 million for the next year.
PsiQuantum signed a $125 million expanded DARPA agreement in July. Like Microsoft, it entered the final stage of the Quantum Benchmarking Initiative through US2QC, a related program, without passing through the initiative's first two stages.
The team measured fewer logical errors in the larger of two codes, built from 64 physical qubits, over up to eight rounds. Over longer runs, the authors concluded only that logical error rates did not grow with code distance.
