Dynamic compensation for pump-induced frequency shift in Kerr-cat qubit initialization

• URL: http://arxiv.org/abs/2408.14112v3
• Date: Thu, 10 Oct 2024 10:00:53 GMT
• Title: Dynamic compensation for pump-induced frequency shift in Kerr-cat qubit initialization
• Authors: Yifang Xu, Ziyue Hua, Weiting Wang, Yuwei Ma, Ming Li, Jiajun Chen, Jie Zhou, Xiaoxuan Pan, Lintao Xiao, Hongwei Huang, Weizhou Cai, Hao Ai, Yu-xi Liu, Chang-Ling Zou, Luyan Sun,
• Abstract summary: The noise-biased Kerr-cat qubit is an attractive candidate for fault-tolerant quantum computation. Here, we propose and demonstrate a dynamic compensation method to mitigate the effect of PIFS. We realize a stabilized Kerr-cat qubit and validate the advantages of the dynamic compensation method. This work paves the way for scalable quantum processors that leverage the bias-preserving properties of Kerr-cat qubits.
• Score: 34.50064624081621
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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 (PIFS). Here, we propose and demonstrate a dynamic compensation method to mitigate the effect of PIFS during the Kerr-cat qubit initialization. Utilizing a novel nonlinearity-engineered triple-loop SQUID device, we realize a stabilized Kerr-cat qubit and validate the advantages of the dynamic compensation method by improving the initialization fidelity from 57% to 78%, with a projected fidelity of 91% after excluding 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 paves the way for scalable quantum processors that leverage the bias-preserving properties of Kerr-cat qubits.

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