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

被引：4

作者：

Yang, Xiaohan ^{[1
,2
,3
,4
]}

Chu, Ji ^{[1
,2
,3
]}

Guo, Zechen ^{[1
,2
,3
]}

Huang, Wenhui ^{[1
,2
,3
]}

Liang, Yongqi ^{[1
,2
,3
]}

Liu, Jiawei ^{[1
,2
,3
]}

Qiu, Jiawei ^{[1
,2
,3
]}

Sun, Xuandong ^{[1
,2
,3
,4
]}

Tao, Ziyu ^{[1
,2
,3
,4
]}

Zhang, Jiawei ^{[1
,2
,3
]}

Zhang, Jiajian ^{[1
,2
,3
,4
]}

Zhang, Libo ^{[1
,2
,3
]}

Zhou, Yuxuan ^{[1
,2
,3
]}

Guo, Weijie ^{[2
]}

Hu, Ling ^{[1
,2
,3
]}

Jiang, Ji ^{[1
,2
,3
]}

Liu, Yang ^{[2
]}

Linpeng, Xiayu ^{[2
]}

Chen, Tingyong ^{[1
,2
,3
]}

Chen, Yuanzhen ^{[1
,2
,3
,4
]}

Niu, Jingjing ^{[2
,5
]}

Liu, Song ^{[1
,2
,3
,5
]}

Zhong, Youpeng ^{[1
,2
,3
,5
]}

Yu, Dapeng ^{[1
,2
,3
,4
,5
]}

机构：

[1] Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen, Guangdong, Peoples R China

[2] Int Quantum Acad, Shenzhen, Guangdong, Peoples R China

[3] Southern Univ Sci & Technol, Guangdong Prov Key Lab Quantum Sci & Engn, Shenzhen, Guangdong, Peoples R China

[4] Southern Univ Sci & Technol, Dept Phys, Shenzhen, Guangdong, Peoples R China

[5] Hefei Natl Lab, Shenzhen Branch, Shenzhen 518048, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2024年 / 133卷 / 17期

基金：

中国国家自然科学基金;

关键词：

LOGIC;

D O I：

10.1103/PhysRevLett.133.170601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 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.

引用

页数：8