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In Situ Mixer Calibration for Superconducting Quantum Circuits

Nan Wu, Jing Lin, Changrong Xie, Zechen Guo,Wenhui Huang,Libo Zhang,Yuxuan Zhou,Xuandong Sun, Jiawei Zhang,Weijie Guo,Xiayu Linpeng,Song Liu, Yang Liu, Wenhui Ren,Ziyu Tao, Ji Jiang,Ji Chu,Jingjing Niu,Youpeng Zhong,Dapeng Yu

APPLIED PHYSICS LETTERS(2024)

Southern Univ Sci & Technol

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Abstract
Mixers play a crucial role in superconducting quantum computing, primarily by facilitating frequency conversion of signals to enable precise control and readout of quantum states. However, imperfections, particularly local oscillator leakage and unwanted sideband signal, can significantly compromise control fidelity. To mitigate these defects, regular and precise mixer calibrations are indispensable, yet they pose a formidable challenge in large-scale quantum control. Here, we introduce an in situ and scalable mixer calibration scheme using superconducting qubits. Our method leverages the qubit's response to imperfect signals, allowing for calibration without modifying the wiring configuration. We experimentally validate the efficacy of this technique by benchmarking single-qubit gate error and qubit coherence time.
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