Improved error correction with leakage reduction units built into qubit measurement in a superconducting quantum processor
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866917097093726208 |
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| author | Xin, Yuejie van der Meer, Sean L. M. Serra-Peralta, Marc Vroomans, Tim H. F. Finkel, Matvey Veen, Hendrik M. Beekman, Mark W. DiCarlo, Leonardo |
| author_facet | Xin, Yuejie van der Meer, Sean L. M. Serra-Peralta, Marc Vroomans, Tim H. F. Finkel, Matvey Veen, Hendrik M. Beekman, Mark W. DiCarlo, Leonardo |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_17460 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Improved error correction with leakage reduction units built into qubit measurement in a superconducting quantum processor Xin, Yuejie van der Meer, Sean L. M. Serra-Peralta, Marc Vroomans, Tim H. F. Finkel, Matvey Veen, Hendrik M. Beekman, Mark W. DiCarlo, Leonardo Quantum Physics 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. |
| title | Improved error correction with leakage reduction units built into qubit measurement in a superconducting quantum processor |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2511.17460 |