Department of Physics, University of Basel, Klingelbergstrasse 82, Basel 4056, Switzerland.
1] Department of Physics, University of Basel, Klingelbergstrasse 82, Basel 4056, Switzerland [2] Department of Physics, ETH Zurich, Otto-Stern-Weg 1, Zurich 8093, Switzerland.
Nat Commun. 2015 May 15;6:7165. doi: 10.1038/ncomms8165.
Coupling carbon nanotube devices to microwave circuits offers a significant increase in bandwidth (BW) and signal-to-noise ratio. These facilitate fast non-invasive readouts important for quantum information processing, shot noise and correlation measurements. However, creation of a device that unites a low-disorder nanotube with a low-loss microwave resonator has so far remained a challenge, due to fabrication incompatibility of one with the other. Employing a mechanical transfer method, we successfully couple a nanotube to a gigahertz superconducting matching circuit and thereby retain pristine transport characteristics such as the control over formation of, and coupling strengths between, the quantum dots. Resonance response to changes in conductance and susceptance further enables quantitative parameter extraction. The achieved near matching is a step forward promising high-BW noise correlation measurements on high impedance devices such as quantum dot circuits.
将碳纳米管器件与微波电路相耦合可以显著提高带宽 (BW) 和信噪比。这些优势促进了快速的非侵入式读出，这对于量子信息处理、散粒噪声和相关测量非常重要。然而，由于制造工艺的不兼容，制造一个将低无序纳米管与低损耗微波谐振器结合在一起的器件一直是一个挑战。通过采用机械转移方法，我们成功地将一个纳米管与一个千兆赫超导匹配电路相耦合，从而保留了原始的传输特性，例如对量子点的形成和耦合强度的控制。对电导和电纳变化的共振响应进一步实现了定量参数提取。这种近乎匹配的实现是向前迈出的一步，有望在高阻抗器件（如量子点电路）上进行高 BW 噪声相关测量。
