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Amplitude and frequency sensing of microwave fields with a superconducting transmon qudit
npj Quantum Information ( IF 7.6 ) Pub Date : 2020-06-25 , DOI: 10.1038/s41534-020-00287-w
M. Kristen , A. Schneider , A. Stehli , T. Wolz , S. Danilin , H. S. Ku , J. Long , X. Wu , R. Lake , D. P. Pappas , A. V. Ustinov , M. Weides

Experiments with superconducting circuits require careful calibration of the applied pulses and fields over a large frequency range. This remains an ongoing challenge as commercial semiconductor electronics are not able to probe signals arriving at the chip due to its cryogenic environment. Here, we demonstrate how the on-chip amplitude and frequency of a microwave signal can be inferred from the ac Stark shifts of higher transmon levels. In our time-resolved measurements we employ Ramsey fringes, allowing us to detect the amplitude of the systems transfer function over a range of several hundreds of MHz with an energy sensitivity on the order of 10−4. Combined with similar measurements for the phase of the transfer function, our sensing method can facilitate pulse correction for high fidelity quantum gates in superconducting circuits. Additionally, the potential to characterize arbitrary microwave fields promotes applications in related areas of research, such as quantum optics or hybrid microwave systems including photonic, mechanical or magnonic subsystems.



中文翻译:

超导超谐对微波场的振幅和频率感测

使用超导电路的实验要求仔细校准大频率范围内施加的脉冲和场。由于商业半导体电子器件由于其低温环境而无法探测到达芯片的信号,因此这仍然是一个持续的挑战。在这里,我们演示了如何从较高transmon电平的ac Stark位移中推断出微波信号的片上幅度和频率。在我们的时间分辨测量中,我们使用拉姆齐条纹,使我们能够在几百MHz的范围内检测系统传递函数的振幅,能量灵敏度为10 -4量级。结合对传递函数相位的类似测量,我们的传感方法可以促进超导电路中高保真量子门的脉冲校正。此外,表征任意微波场的潜力促进了相关研究领域的应用,例如量子光学或包括光子,机械或磁子系统的混合微波系统。

更新日期:2020-06-25
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