Coupler-Assisted Leakage Reduction for Scalable Quantum Error Correction with Superconducting Qubits

Superconducting qubits are a promising platform for building fault-tolerant quantum computers, with recent achievement showing the suppression of logical error with increasing code size. However, leakage into noncomputational states, a common issue in practical quantum systems including superconducting circuits, introduces correlated errors that undermine quantum error correction (QEC) scalability. Here, we propose and demonstrate a leakage reduction scheme utilizing tunable couplers, a widely adopted ingredient in large-scale superconducting quantum processors. Leveraging the strong frequency tunability of the couplers and stray interaction between the couplers and readout resonators, we eliminate state leakage on the couplers, thus suppressing space-correlated errors caused by population propagation among the couplers. Assisted by the couplers, we further reduce leakage to higher qubit levels with high efficiency (98.1%) and low error rate on the computational subspace (0.58%), suppressing time-correlated errors during QEC cycles. The performance of our scheme demonstrates its potential as an indispensable building block for scalable QEC with superconducting qubits.

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Institutions

Publication Details

Journal
Physical Review Letters
Published
2024-10-24
DOI
https://doi.org/10.1103/physrevlett.133.170601
Citations
14
Primary Topic
Quantum Computing Algorithms and Architecture
Type
article
Field-Weighted Citation Impact
4.86

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article

Coupler-Assisted Leakage Reduction for Scalable Quantum Error Correction with Superconducting Qubits

Ji Chu, Xiayu Linpeng, Wenhui Huang, Ziyu Tao et al.
14 citations
Physical Review Letters
Quantum Computing Algorithms and Architecture
4.86
article

Coupler-Assisted Leakage Reduction for Scalable Quantum Error Correction with Superconducting Qubits

Ji Chu, Xiayu Linpeng, Wenhui Huang, Ziyu Tao, Youpeng Zhong, Ling Hu, Ji Jiang, Yuxuan Zhou, Zechen Guo, Tingyong Chen, Jingjing Niu, Jiawei Qiu, Jiawei Liu, Libo Zhang, Song Liu, Yang Liu, Dapeng Yu, Yuanzhen Chen, Yongqi Liang, Jiajian Zhang, Xuandong Sun, Weijie Guo, Jiawei Zhang, Xiaohan Yang
article en
14 citations

Abstract

Superconducting qubits are a promising platform for building fault-tolerant quantum computers, with recent achievement showing the suppression of logical error with increasing code size. However, leakage into noncomputational states, a common issue in practical quantum systems including superconducting circuits, introduces correlated errors that undermine quantum error correction (QEC) scalability. Here, we propose and demonstrate a leakage reduction scheme utilizing tunable couplers, a widely adopted ingredient in large-scale superconducting quantum processors. Leveraging the strong frequency tunability of the couplers and stray interaction between the couplers and readout resonators, we eliminate state leakage on the couplers, thus suppressing space-correlated errors caused by population propagation among the couplers. Assisted by the couplers, we further reduce leakage to higher qubit levels with high efficiency (98.1%) and low error rate on the computational subspace (0.58%), suppressing time-correlated errors during QEC cycles. The performance of our scheme demonstrates its potential as an indispensable building block for scalable QEC with superconducting qubits.

Physical Review LettersVol. 133(17)
Southern University of Science and Technology (CN), Hefei University (CN), Quantum (Australia) (AU)
National Natural Science Foundation of China, Science, Technology and Innovation Commission of Shenzhen Municipality, Basic and Applied Basic Research Foundation of Guangdong Province
Openalex Percentile: Top 4%
Quantum Computing Algorithms and Architecture
4.86
DOISourceOpenAlex
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