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Fabrication of Low Temperature Carbon Nanotube Vertical Interconnects Compatible with Semiconductor Technology
Published on: December 7, 2015
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Clean carbon nanotubes coupled to superconducting impedance-matching circuits
V Ranjan1, G Puebla-Hellmann2, M Jung1
1Department of Physics, University of Basel, Klingelbergstrasse 82, Basel 4056, Switzerland.
Nature Communications
|May 16, 2015
Summary
We successfully coupled carbon nanotubes to microwave circuits using a mechanical transfer method, enabling high-bandwidth quantum information processing. This breakthrough overcomes fabrication challenges for improved signal-to-noise ratio in quantum dot measurements.
Area of Science:
- Quantum Information Science
- Nanotechnology
- Microwave Engineering
Background:
- Coupling carbon nanotube (CNT) devices to microwave circuits significantly enhances bandwidth (BW) and signal-to-noise ratio (SNR).
- These improvements are crucial for advanced applications like quantum information processing and precise noise measurements.
- A major challenge has been the fabrication incompatibility between low-disorder CNTs and low-loss microwave resonators.
Purpose of the Study:
- To develop a method for effectively coupling CNT devices to microwave circuits while preserving the CNTs' intrinsic quantum properties.
- To enable high-bandwidth, non-invasive readouts for quantum information processing and correlation measurements.
- To overcome fabrication challenges hindering the integration of CNTs with superconducting microwave resonators.
Main Methods:
- Utilized a mechanical transfer technique to integrate a low-disorder CNT with a gigahertz superconducting matching circuit.
- Maintained pristine transport characteristics of the CNT, including control over quantum dot formation and coupling strengths.
- Analyzed the resonance response to changes in conductance and susceptance for quantitative parameter extraction.
Main Results:
- Successfully achieved a near-perfect impedance match between the CNT device and the superconducting microwave circuit.
- Preserved the high-quality transport characteristics of the quantum dots within the CNT.
- Demonstrated the feasibility of quantitative parameter extraction through resonance response analysis.
Conclusions:
- The mechanical transfer method effectively bridges the fabrication gap between CNTs and superconducting microwave circuits.
- This integration facilitates high-bandwidth noise correlation measurements on high-impedance quantum dot circuits.
- Represents a significant advancement towards practical quantum information processing and advanced quantum measurements.
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