High-performance conditional-driving gate for Kerr parametric oscillator qubits
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866929694504386560 |
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| author | Chono, Hiroomi Goto, Hayato |
| author_facet | Chono, Hiroomi Goto, Hayato |
| contents | Kerr parametric oscillators (KPOs), two-photon driven Kerr-nonlinear resonators, can stably hold coherent states with opposite-sign amplitudes and are promising devices for quantum computing. Recently, we have theoretically proposed a two-qubit gate $R_{zz}$ for highly detuned KPOs and called it a conditional-driving gate [Chono $\textit{et al}$., Phys. Rev. Res. $\textbf{4}$, 043054 (2022)]. In this study, analyzing its superconducting-circuit model and deriving a corresponding static model, we find that an AC-Zeeman shift due to the flux pulse for the gate operation largely affects the gate performance. This effect becomes a more aggravating factor with shorter gate times, leading to an increase in the error rate. We thus propose a method to cancel this undesirable effect. Furthermore, through the use of shortcuts to adiabaticity and the optimization of flux pulses, we numerically demonstrate a conditional-driving gate with average fidelity exceeding 99.9$\%$ twice faster than that without the proposed method. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_00552 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | High-performance conditional-driving gate for Kerr parametric oscillator qubits Chono, Hiroomi Goto, Hayato Quantum Physics Superconductivity Kerr parametric oscillators (KPOs), two-photon driven Kerr-nonlinear resonators, can stably hold coherent states with opposite-sign amplitudes and are promising devices for quantum computing. Recently, we have theoretically proposed a two-qubit gate $R_{zz}$ for highly detuned KPOs and called it a conditional-driving gate [Chono $\textit{et al}$., Phys. Rev. Res. $\textbf{4}$, 043054 (2022)]. In this study, analyzing its superconducting-circuit model and deriving a corresponding static model, we find that an AC-Zeeman shift due to the flux pulse for the gate operation largely affects the gate performance. This effect becomes a more aggravating factor with shorter gate times, leading to an increase in the error rate. We thus propose a method to cancel this undesirable effect. Furthermore, through the use of shortcuts to adiabaticity and the optimization of flux pulses, we numerically demonstrate a conditional-driving gate with average fidelity exceeding 99.9$\%$ twice faster than that without the proposed method. |
| title | High-performance conditional-driving gate for Kerr parametric oscillator qubits |
| topic | Quantum Physics Superconductivity |
| url | https://arxiv.org/abs/2410.00552 |