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.

中文翻译：

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用于超导量子电路的原位混频器校准


混频器在超导量子计算中发挥着至关重要的作用，主要是通过促进信号的频率转换以实现量子态的精确控制和读出。然而，缺陷，特别是本振泄漏和不需要的边带信号，会严重影响控制保真度。为了减轻这些缺陷，定期和精确的混频器校准是必不可少的，但它们在大规模量子控制中构成了巨大的挑战。在这里，我们介绍了一种使用超导量子比特的原位和可扩展的混频器校准方案。我们的方法利用量子比特对不完美信号的响应，允许在不修改布线配置的情况下进行校准。我们通过对单量子比特门误差和量子比特相干时间进行基准测试来实验验证该技术的有效性。