Qubits are sensitive to noise and quickly accumulate errors. To build a fault-tolerant quantum computer, the system must be taught to detect them and quickly determine how to fix them. Additional measurements are used for this purpose: they do not show the quantum state directly but indicate possible errors. The decoder analyzes this data and decides which corrections the system should apply.
The challenge is that decisions need to be made very quickly. If processing takes too long, errors continue to accumulate, and the computation loses reliability. Therefore, not only algorithms but also low latency between the quantum processor, classical computations, and the control system are important for correction.
https://forklog.com/en/quantum-x-labs-and-iqcc-to-test-ai-decoder/
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