超导片上滤波器组的定向滤波器设计与仿真

IF 1.1 3区 物理与天体物理 Q4 PHYSICS, APPLIED
Louis H. Marting, Kenichi Karatsu, Akira Endo, Jochem J. A. Baselmans, Alejandro Pascual Laguna
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引用次数: 0

摘要

许多超导片上滤波器都存在与每个滤波器后面的探测器耦合不良的问题。这是常用半波长滤波器的固有问题,其最大理论耦合度为 50%。在本文中,我们引入了一种相位相干滤波器,称为定向滤波器,其理论耦合度为 100%。为了研究和比较不同类型的滤波器,我们首先分析了 DESHIMA 2.0 滤波器芯片的滤波器频率散射、损耗和光谱分辨率。根据测量到的制造公差和损耗,我们调整了电路仿真的输入参数,定量再现了测量结果。我们发现,频率散射是由纳米级线宽变化引起的,而光谱分辨率的差异仅由介质损耗引起。最后,我们将这些现实参数纳入一个完整的滤波器组模型,并模拟了各种光谱分辨率和过采样值。在所有情况下,定向滤波器组与探测器的耦合度都明显高于半波谐振器滤波器组。定向滤波器无需使用过采样来提高总效率,而是能捕捉到介质损耗后的几乎所有剩余功率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Directional Filter Design and Simulation for Superconducting On-Chip Filter-Banks

Directional Filter Design and Simulation for Superconducting On-Chip Filter-Banks

Many superconducting on-chip filter-banks suffer from poor coupling to the detectors behind each filter. This is a problem intrinsic to the commonly used half-wavelength filter, which has a maximum theoretical coupling of 50 %. In this paper, we introduce a phase-coherent filter, called a directional filter, which has a theoretical coupling of 100 %. In order to study and compare different types of filter-banks, we first analyze the measured filter frequency scatter, losses, and spectral resolution of a DESHIMA 2.0 filter-bank chip. Based on measured fabrication tolerances and losses, we adapt the input parameters for our circuit simulations, quantitatively reproducing the measurements. We find that the frequency scatter is caused by nanometer-scale line width variations and that variances in the spectral resolution is caused by losses in the dielectric only. Finally, we include these realistic parameters in a full filter-bank model and simulate a wide range of spectral resolutions and oversampling values. For all cases, the directional filter-bank has significantly higher coupling to the detectors than the half-wave resonator filter-bank. The directional filter eliminates the need to use oversampling as a method to improve the total efficiency, instead capturing nearly all the power remaining after dielectric losses.

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来源期刊
Journal of Low Temperature Physics
Journal of Low Temperature Physics 物理-物理:凝聚态物理
CiteScore
3.30
自引率
25.00%
发文量
245
审稿时长
1 months
期刊介绍: The Journal of Low Temperature Physics publishes original papers and review articles on all areas of low temperature physics and cryogenics, including theoretical and experimental contributions. Subject areas include: Quantum solids, liquids and gases; Superfluidity; Superconductivity; Condensed matter physics; Experimental techniques; The Journal encourages the submission of Rapid Communications and Special Issues.
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