flâneur

[2511.17460] Improved error correction with leakage reduction units built into qubit measurement in a superconducting quantum processor

arxiv.org · 5,994 words · saved by 1 readers

Abstract:Leakage to non-computational states is a source of correlated errors in both time and space that limits the effectiveness of quantum error correction (QEC) with superconducting circuits. We present and experimentally demonstrate a high-fidelity, leakage reduction unit (LRU) operating concurrently with transmon measurement without incurring time overhead. Adapted from double-drive reset of population (DDROP), the protocol utilizes simultaneous drives on the transmon and its readout resonator, leveraging the dispersive shift to create a directional process that returns the transmon to the computational subspace. The LRU achieves a 98.4% leakage removal fraction without compromising the computational-state assignment fidelity (99.2%). We combine LRU-enhanced measurement and neural-network decoding to successfully suppress logical error rates in both memory and stability QEC experiments without any post-selection.

Improved error correction with leakage reduction units built into qubit measurement in a superconducting quantum processor Yuejie Xin,1, 2 Sean L. M. van der Meer,1, 2 Marc Serra-Peralta,1, 3 Tim H. F. Vroomans,1, 2 Matvey Finkel,1, 2 Hendrik M. Veen,1, 2, ∗ Mark W. Beekman,4 and Leonardo DiCarlo1, 2, † 1 QuTech, Delft…

saved by

related reading