Measurements of a Quantum Dot with an Impedance-Matching On-Chip LC Resonator at GHz Frequencies
Measurements of a Quantum Dot with an Impedance-Matching On-Chip LC Resonator at GHz Frequencies
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使用阻抗匹配片上 LC 谐振器在 GHz 频率下测量量子点
DOI：
10.1103/physrevapplied.8.054006
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
France.
中科院分区：
文献类型：
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作者：
M. Harabula;T. Hasler;G. Fulop;M. Jung;V. Ranjan;C. S. D. O. Physics;U. Basel;82 Klingelbergstrasse;Basel;Switzerland.;D. R. Institute;Dgist;333 TechnoJungang;Hyeongpung;Daegu;J Korea;Quantronics Group;Spec;Cea;Cnrs;U. Paris;C. Saclay;Gif;France.
我们报告的实现键合桥片上超导线圈和它的使用阻抗匹配的高欧姆量子点（QD）的$\rm{3~GHz}$测量设置。线圈，建模为集总元件LC谐振器，是更紧凑，具有更宽的带宽比谐振器的基础上共面传输线（例如，$\lambda/4$阻抗变压器和短截线调谐器）在潜在的更好的信噪比。特别是对于测量设备发出的辐射（如散粒噪声），50倍的带宽减少了获取频谱密度的时间。的谐振频率，接近3.25 GHz，是三倍高于一个先前报道的引线键合线圈。作为原理的证明，我们制作了一个LC电路，实现阻抗匹配的$\rm{\sim 15~k\Omega}$负载，并验证它与负载定义的碳纳米管量子点，我们测量的散粒噪声在库仑阻塞制度。
We report the realization of a bonded-bridge on-chip superconducting coil and its use in impedance-matching a highly ohmic quantum dot (QD) to a $\rm{3~GHz}$ measurement setup. The coil, modeled as a lumped-element $LC$ resonator, is more compact and has a wider bandwidth than resonators based on coplanar transmission lines (e.g. $\lambda/4$ impedance transformers and stub tuners) at potentially better signal-to-noise ratios. In particular for measurements of radiation emitted by the device, such as shot noise, the 50$\times$ larger bandwidth reduces the time to acquire the spectral density. The resonance frequency, close to 3.25 GHz, is three times higher than that of the one previously reported wire-bonded coil. As a proof of principle, we fabricated an $LC$ circuit that achieves impedance-matching to a $\rm{\sim 15~k\Omega}$ load and validate it with a load defined by a carbon nanotube QD of which we measure the shot noise in the Coulomb blockade regime.