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arXiv 1211.2175quant-ph
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利用量子位测量微波脉冲畸变改善量子门的性能

Improving quantum gate fidelities by using a qubit to measure microwave pulse distortions

Simon Gustavsson, Olger Zwier, Jonas Bylander, Fei Yan, Fumiki Yoshihara, Yasunobu Nakamura, Terry P. Orlando, William D. Oliver

摘要:

提出了一种新的方法来确定超导量子比特中的脉冲缺陷,并提高单门保真度。通过施加连续的正和负$π$脉冲,我们放大了由于微波脉冲失真引起的量子比特演化,这导致量子比特状态围绕垂直于预期旋转轴的轴旋转。测量这些旋转作为脉冲周期的函数,使我们能够重建到达样品的微波脉冲的形状。使用提取的响应对输入信号进行预失真,我们能够改善脉冲形状,并达到高于99.8%的平均单量子位门保真度。

英文摘要:

We present a new method for determining pulse imperfections and improving the single-gate fidelity in a superconducting qubit. By applying consecutive positive and negative $π$ pulses, we amplify the qubit evolution due to microwave pulse distortion, which causes the qubit state to rotate around an axis perpendicular to the intended rotation axis. Measuring these rotations as a function of pulse period allows us to reconstruct the shape of the microwave pulse arriving at the sample. Using the extracted response to predistort the input signal, we are able to improve the pulse shapes and to reach an average single-qubit gate fidelity higher than 99.8%.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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