量子点自旋量子比特中纳秒脉冲失真测量与校正
Measuring and correcting nanosecond pulse distortions in quantum-dot spin qubits
AI总结：
本研究提出了一种用于量子点自旋量子比特中纳秒脉冲失真的测量与校正方法，通过数字预失真滤波器提高控制保真度。
摘要：
门定义的半导体量子点利用快速的电控来操控单个电子的自旋和电荷状态。电脉冲失真可能限制控制保真度，但在设备层面难以测量。在这里，我们利用偏移轴脉冲光谱法来表征硅双量子点中的基带脉冲失真。我们提取了门电压冲击响应，并应用数字预失真滤波器来消除持续时间超过1纳秒的脉冲失真。通过预失真，我们减少了单重态-三重态量子比特中相干交换振荡的频率啁啾。我们的结果表明，这是一种可扩展且可调谐的用于表征量子点自旋量子比特脉冲失真方法。
英文摘要：
Gate-defined semiconductor quantum dots utilize fast electrical control to manipulate spin and charge states of individual electrons. Electrical pulse distortions can limit control fidelities but are difficult to measure at the device level. Here, we use detuning-axis pulsed spectroscopy to characterize baseband pulse distortions in a silicon double quantum-dot. We extract the gate-voltage impulse response and apply a digital pre-distortion filter to eliminate pulse distortions on timescales longer than 1~ns. With the pre-distortion, we reduce the frequency chirp of coherent exchange oscillations in a singlet-triplet qubit. Our results suggest a scalable and tuning-efficient method for characterizing pulse distortions in quantum-dot spin qubits.
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