Engineering the microwave to infrared noise photon flux for superconducting quantum systems.
Engineering the microwave to infrared noise photon flux for superconducting quantum systems.
复制标题
为超导量子系统设计微波炉到红外噪声光子通量。
DOI：
10.1140/epjqt/s40507-022-00121-6
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发表时间：
2022
影响因子：
5.3
通讯作者：
Weides M
中科院分区：
文献类型：
--
作者：
Danilin S;Barbosa J;Farage M;Zhao Z;Shang X;Burnett J;Ridler N;Li C;Weides M
电磁滤波对于毫开尔文温度下超导量子电路的相干控制、操作和读出是必不可少的。在几GHz的过渡频率附近抑制杂散模式是很好理解的，主要通过片上和封装考虑来实现。更高频率的噪声光子-超过对破坏能量-会引起退相干，并且在到达封装的量子芯片之前需要光谱工程。进入冰箱和量子电路的外部电线为这些光子提供了一条直接的路径。本文对同轴滤波布线中噪声光子流进行了定量分析和实验研究。在室温下的同轴电缆的衰减和噪声光子通量估计典型的布线配置。紧凑型低温微波低通滤波器与CR-110和Esorb-230吸收介质填充沿着实验数据，在室温和低温温度高达70 GHz。1至10 GHz之间的滤波器截止频率由滤波器长度设置，滚降取决于材料。测量了Esorb-230材料在75至110 GHz的成对破坏频率范围内的相对介电常数和磁导率，并计算了该频率范围内的滤波器特性。由于过滤器的噪声光子通量的估计戏剧性的抑制证明了它的有用性与超导量子系统的实验。
Electromagnetic filtering is essential for the coherent control, operation and readout of superconducting quantum circuits at milliKelvin temperatures. The suppression of spurious modes around transition frequencies of a few GHz is well understood and mainly achieved by on-chip and package considerations. Noise photons of higher frequencies – beyond the pair-breaking energies – cause decoherence and require spectral engineering before reaching the packaged quantum chip. The external wires that pass into the refrigerator and go down to the quantum circuit provide a direct path for these photons. This article contains quantitative analysis and experimental data for the noise photon flux through coaxial, filtered wiring. The attenuation of the coaxial cable at room temperature and the noise photon flux estimates for typical wiring configurations are provided. Compact cryogenic microwave low-pass filters with CR-110 and Esorb-230 absorptive dielectric fillings are presented along with experimental data at room and cryogenic temperatures up to 70 GHz. Filter cut-off frequencies between 1 to 10 GHz are set by the filter length, and the roll-off is material dependent. The relative dielectric permittivity and magnetic permeability for the Esorb-230 material in the pair-breaking frequency range of 75 to 110 GHz are measured, and the filter properties in this frequency range are calculated. The estimated dramatic suppression of the noise photon flux due to the filter proves its usefulness for experiments with superconducting quantum systems.
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