Dynamic compensation for pump-induced frequency shift in Kerr-cat qubit initialization
The noise-biased Kerr-cat qubit is an attractive candidate for fault-tolerant quantum computation; however, its initialization faces challenges due to the squeezing pump-induced frequency shift. Here we propose and demonstrate a dynamic compensation method to mitigate the effect of pump-induced frequency shift during the Kerr-cat qubit initialization. Using a nonlinearity-engineered multiloop superconducting quantum interference device, we realize a stabilized Kerr-cat qubit and validate the advantages of the dynamic compensation method by increasing the initialization fidelity from 57% to 78%, with a projected fidelity of 91% after exclusion of state preparation and measurement errors. Our results not only advance the practical implementation of Kerr-cat qubits, but also provide valuable insights into the fundamental adiabatic dynamics of these systems. This work is valuable for scalable quantum processors that leverage the noise-biased properties of Kerr-cat qubits.
Authors
- Chang‐Ling Zou (ORCID: https://orcid.org/0000-0003-2484-7292)
- Luyan Sun (ORCID: https://orcid.org/0000-0003-4419-5674)
- Hsiao‐Wen Huang (ORCID: https://orcid.org/0000-0001-9421-5640)
- Lintao Xiao (ORCID: https://orcid.org/0000-0002-1071-4918)
- Weizhou Cai (ORCID: https://orcid.org/0000-0002-0650-0861)
- Ziyue Hua (ORCID: https://orcid.org/0000-0002-4860-8803)
- Xiaoxuan Pan (ORCID: https://orcid.org/0000-0002-7081-9172)
- Yifang Xu
- Xiaogang Li (ORCID: https://orcid.org/0000-0001-9255-7559)
- Jiajun Chen (ORCID: https://orcid.org/0009-0009-4984-0565)
- Yuxi Liu (ORCID: https://orcid.org/0000-0002-0182-084X)
- Weiting Wang (ORCID: https://orcid.org/0000-0002-1510-772X)
- Jie Zhou (ORCID: https://orcid.org/0009-0009-6880-7058)
- Hao Ai (ORCID: https://orcid.org/0009-0002-8516-521X)
- Yuwei Ma (ORCID: https://orcid.org/0009-0002-6692-1921)
Institutions
- University of Science and Technology of China (CN)
- Hefei University (CN)
- Tsinghua University (CN)
Publication Details
- Journal
- Physical Review Applied
- Published
- 2025-03-24
- DOI
- https://doi.org/10.1103/physrevapplied.23.034060
- Citations
- 4
- Primary Topic
- Quantum Information and Cryptography
- Type
- article
- Field-Weighted Citation Impact
- 9.92
Funders
- National Natural Science Foundation of China
- National Key Research and Development Program of China
- Fundamental Research Funds for the Central Universities