Quantum computing company IonQ (NYSE: IONQ) has solved one of the key challenges to achieving fault-tolerant quantum computing. The company announced it has successfully developed and tested the industry's first end-to-end real-time quantum error correction decoder powered by a single ordinary commercial central processing unit (CPU).

◆ Why quantum error correction matters

Quantum error correction is regarded as a core technology for realizing practical fault-tolerant quantum computers. Physical qubits are sensitive to environmental noise, so errors arising during computation must be quickly detected and corrected.

The problem is that processing these errors in real time itself imposed a significant computing burden. With conventional error-decoding methods, classical computers' processing capacity can hit its limits, in which case the quantum computer must pause its computations while waiting, creating a bottleneck.

IonQ explained that this technology demonstrates that complex error correction tasks can be continuously handled with just a single ordinary computer processor. This means real-time error correction can be performed in the background while maintaining the quantum system's computation speed.

Nicolas Delfosse, co-author of the paper and IonQ's head of quantum research, said, "Successfully validating real-time decoding across hundreds of logical qubits and millions of logical operations is an important milestone." He added, "In particular, the fact that the decoder runs on a single CPU presents a practical path toward commercially scaled fault-tolerant quantum computing."

◆ Passed simulation of 408 logical qubits and 31.5 million operations

According to the technical study IonQ published on arXiv, the company evaluated a dual-decoder architecture on a complex benchmark circuit simulating 408 logical qubits across up to 88 memory blocks and magic state factories. The circuit executed more than 31.5 million individual quantum operations at the 'MegaQuOp' scale.

Notably, under standard operating noise conditions, the 'stretch' time added by IonQ's decoder was as little as 0.02%. According to the company, this means the additional processing burden from error decoding had virtually no impact on the overall quantum computation time.

John Gamble, vice president of architecture at IonQ, said, "By directly validating each component, IonQ is enabling the cost-efficient scaling of quantum systems." He explained, "These demonstrable results support IonQ's vision of fault-tolerant quantum computing, which centers on time-to-solution, cost, and energy efficiency as key criteria."

◆ 'Walking Cat' architecture validated... Foundation for scaling to thousands of qubits

This achievement also signifies the validation of one of the core technologies of the 'Walking Cat' architecture IonQ is independently developing. In particular, it demonstrated the possibility that even as the number of logical qubits in a quantum system grows and computations become more complex, the processing burden on supporting classical computing hardware does not need to increase exponentially.

IonQ expects this technology to serve as a key technical foundation for scaling beyond 256 physical qubits to industrial quantum computing platforms controlling thousands of qubits.

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