aiqbench analysis
This research presents a breakthrough in quantum error correction by introducing the first globally-controlled architecture with zero qubit overhead, effectively eliminating the need to distinguish between computational and auxiliary qubits. By utilizing cyclic stabilizer codes compatible with global iSWAP gates, the study achieves fault-tolerant thresholds nearly seven orders of magnitude higher than previous estimates for similar arrays. The work also highlights a viable trade-off where adding limited local measurement sites can further enhance performance while maintaining wiring simplicity.
Quantum error correction with global control
arXiv:2608.05821v1 Announce Type: new Abstract: Reaching fault tolerance means scaling qubit counts by orders of magnitude, a jump that conventional superconducting architectures cannot sustain without solving the so-called `wiring problem'. Global control sidesteps this bottleneck, but implementing quantum error correction (QEC) on previously proposed global architectures incurs extremely steep overhead costs, due to the need for separate correction procedures for the computational and auxiliary qubits that comprise the global device. We resolve this by introducing the first globally-controlled architecture with zero qubit overhead. Every physical qubit is a computational qubit, and thus, every qubit is protected under a single error correcting scheme. We identify a class of cyclic stabilizer codes realizable through global iSWAP and single-qubit gates, yielding QEC thresholds nearly seven orders of magnitude larger than previous estimates for globally-controlled arrays. We further show these thresholds improve systematically as the global architecture is augmented with a limited amount of local measurement sites, demonstrating a trade-off between wiring simplicity and fault-tolerant performance.
Abstract:Reaching fault tolerance means scaling qubit counts by orders of magnitude, a jump that conventional superconducting architectures cannot sustain without solving the so-called `wiring problem'. Global control sidesteps this bottleneck, but implementing quantum error correction (QEC) on previously proposed global architectures incurs extremely steep overhead costs, due to the need for separate correction procedures for the computational and auxiliary qubits that comprise the global device. We resolve this by introducing the first globally-controlled architecture with zero qubit overhead. Every physical qubit is a computational qubit, and thus, every qubit is protected under a single error correcting scheme. We identify a class of cyclic stabilizer codes realizable through global iSWAP and single-qubit gates, yielding QEC thresholds nearly seven orders of magnitude larger than previous estimates for globally-controlled arrays. We further show these thresholds improve systematically as the global architecture is augmented with a limited amount of local measurement sites, demonstrating a trade-off between wiring simplicity and fault-tolerant performance.
arXiv:2608.05821 [quant-ph]
(or arXiv:2608.05821v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2608.05821 Focus to learn more arXiv-issued DOI via DataCite (pending registration)
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