Suppressing spurious transitions using spectrally balanced pulse

• URL: http://arxiv.org/abs/2502.10116v1
• Date: Fri, 14 Feb 2025 12:27:36 GMT
• Title: Suppressing spurious transitions using spectrally balanced pulse
• Authors: Ruixia Wang, Yaqing Feng, Yujia Zhang, Jiayu Ding, Boxi Li, Felix Motzoi, Yang Gao, Huikai Xu, Zhen Yang, Wuerkaixi Nuerbolati, Haifeng Yu, Weijie Sun, Fei Yan,
• Abstract summary: In superconducting qubits, parasitic interactions can severely limit the performance of quantum gates. We introduce a pulse-shaping technique that uses spectrally balanced microwave pulses to suppress undesired transitions.
• Score: 18.9170657325725
• License:
• Abstract: Achieving precise control over quantum systems presents a significant challenge, especially in many-body setups, where residual couplings and unintended transitions undermine the accuracy of quantum operations. In superconducting qubits, parasitic interactions -- both between distant qubits and with spurious two-level systems -- can severely limit the performance of quantum gates. In this work, we introduce a pulse-shaping technique that uses spectrally balanced microwave pulses to suppress undesired transitions. Experimental results demonstrate an order-of-magnitude reduction in spurious excitations between weakly detuned qubits, as well as a substantial decrease in single-qubit gate errors caused by a strongly coupled two-level defect over a broad frequency range. Our method provides a simple yet powerful solution to mitigate adverse effects from parasitic couplings, enhancing the fidelity of quantum operations and expanding feasible frequency allocations for large-scale quantum devices.

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