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arXiv 2210.04799quant-phcond-mat.mes-hall
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Josephson 行波参量放大器中的互调失真

Intermodulation Distortion in a Josephson Traveling Wave Parametric Amplifier

Ants Remm, Sebastian Krinner, Nathan Lacroix, Christoph Hellings, Francois Swiadek, Graham Norris, Christopher Eichler, Andreas Wallraff

备注：
11 pages, 12 figures
发表信息：
Phys. Rev. Applied 20, 034027 (2023)
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AI总结：

本文研究了 Josephson 行波参量放大器在频分复用读出中产生的互调失真现象，发现其会导致超导量子比特读出的串扰和保真度降低，并建议通过增大泵浦与信号频率间的失谐来缓解此问题。

摘要：

Josephson 行波参量放大器能够以大带宽放大接近量子极限的微弱微波信号，在超导量子计算和单光子探测器运行中有广泛应用。虽然大带宽使其能用于频分复用检测架构，但每个放大器上读出音调数量的增加对动态范围提出了更严格的要求以避免饱和。在此，我们表征了施加于 Josephson 行波参量放大器的不同频分复用音调之间 undesired 的混频过程，这一现象也被称为互调失真。当放大器运行接近其饱和功率时，该效应变得尤为显著。此外，我们证明互调失真会导致超导量子比特复用读出的显著串扰和保真度降低。我们建议在泵浦频率与信号频率之间使用大失谐来缓解串扰。我们的工作提供了对当前 Josephson 行波参量放大器局限性的见解，并强调了进一步研究这些器件的重要性。

英文摘要：

Josephson traveling wave parametric amplifiers enable the amplification of weak microwave signals close to the quantum limit with large bandwidth, which has a broad range of applications in superconducting quantum computing and in the operation of single-photon detectors. While the large bandwidth allows for their use in frequency-multiplexed detection architectures, an increased number of readout tones per amplifier puts more stringent requirements on the dynamic range to avoid saturation. Here, we characterize the undesired mixing processes between the different frequency-multiplexed tones applied to a Josephson traveling wave parametric amplifier, a phenomenon also known as intermodulation distortion. The effect becomes particularly significant when the amplifier is operated close to its saturation power. Furthermore, we demonstrate that intermodulation distortion can lead to significant crosstalk and reduction of fidelity for multiplexed readout of superconducting qubits. We suggest using large detunings between the pump and signal frequencies to mitigate crosstalk. Our work provides insights into the limitations of current Josephson traveling wave parametric amplifiers and highlights the importance of performing further research on these devices.

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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