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Riverlane, NVIDIA, and several control-electronics makers now sell parts of the loop that turns error checks into corrections. Among the superconducting tests surveyed, loops using Riverlane's decoder have met a 10-microsecond budget, in small configurations only.
Buyers already pair control electronics and refrigerators from different suppliers and use open compiler formats. Calibration has a published specification only for pulse jobs. Module links have none. In those two layers, buyers still depend on one vendor.
A quantum computer runs on clocks from nanoseconds to hours. IBM and Xanadu both drew their software layers along those clocks. A buyer still cannot swap one vendor's processor, controller or decoder for another's by recompiling.
The partners built Q-PAC from a QuantWare processor with 17 physical qubits and other suppliers' electronics, refrigeration, and software. They said it went from concept to full operation in five months. They released no gate error rates or benchmark results.
