论文标题
设计频率调节脉冲的滤波器功能，以使离子链中的高保真两个Quitigent
Designing Filter Functions of Frequency-Modulated Pulses for High-Fidelity Two-Qubit Gates in Ion Chains
论文作者
论文摘要
量子计算机中的高保真性两分之二的门通常会因波动的实验参数而受到阻碍。时间变化参数波动的影响导致量子位上的连贯噪声，这可以通过使用适当的滤波器功能设计控制信号来抑制。在这里，我们为被困的离子量子计算机的Mølmer-sørensen门开发了过滤功能，该函数准确地预测了由于任何频率下的小参数波动而导致的门误差变化。然后，我们设计了频率调节激光脉冲的滤波功能，并将此方法与脉冲与静态偏移的脉冲进行比较。在实验上，我们测量了运动模式的噪声光谱，并将其用于设计滤波器功能，从而将门的保真度从五离子链中的99.23（7）％提高到99.55（7）％。
High-fidelity two-qubit gates in quantum computers are often hampered by fluctuating experimental parameters. The effects of time-varying parameter fluctuations lead to coherent noise on the qubits, which can be suppressed by designing control signals with appropriate filter functions. Here, we develop filter functions for Mølmer-Sørensen gates of trapped-ion quantum computers that accurately predict the change in gate error due to small parameter fluctuations at any frequency. We then design the filter functions of frequency-modulated laser pulses, and compare this method with pulses that are robust to static offsets of the motional-mode frequencies. Experimentally, we measure the noise spectrum of the motional modes and use it for designing the filter functions, which improves the gate fidelity from 99.23(7)% to 99.55(7)% in a five-ion chain.
