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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
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High dynamic resistance elements based on a Josephson junction array
Konstantin Yu Arutyunov1,2, Janne Samuel Lehtinen3,4
1National Research University Higher School of Economics, 101000, Moscow, Russia.
Beilstein Journal of Nanotechnology
|March 28, 2020
Summary
Researchers created superconductor-insulator-superconductor junctions for ultra-low temperature experiments. These junctions exhibit high dynamic resistance and enable observation of quantum phenomena like Coulomb blockade and Bloch oscillations.
Area of Science:
- Condensed Matter Physics
- Nanotechnology
Background:
- Superconductor-insulator-superconductor (SIS) junctions are crucial for quantum electronic devices.
- Fabrication of stable nanostructures at ultra-low temperatures presents significant challenges.
Purpose of the Study:
- To fabricate and characterize Al-AlO-Al based SIS junctions.
- To investigate the potential of these junctions as current biasing circuits for quantum measurements.
- To observe quantum phenomena such as Coulomb blockade and Bloch oscillations.
Main Methods:
- Fabrication of Al-AlO-Al nanostructures using conventional lift-off lithography.
- Electrical transport measurements at ultra-low temperatures and zero magnetic field.
- Analysis of dynamic resistance and current-voltage characteristics.
Main Results:
- Achieved high dynamic resistance values (≈10^11 Ω) at low current bias.
- Demonstrated the utility of the fabricated junctions as a stable current biasing circuit.
- Successfully observed Coulomb blockade and Bloch oscillations in ultra-narrow Ti nanowires.
Conclusions:
- The developed Al-AlO-Al SIS junctions are suitable for high-impedance biasing circuits.
- The system facilitates the study of quantum phase-slip effects and related phenomena.
- This work advances the development of nanoscale quantum electronic devices.
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