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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Correlated electron tunneling through two separate quantum dot systems with strong capacitive interdot coupling.

A Hübel¹, K Held, J Weis

¹Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.

Physical Review Letters

|November 13, 2008

Summary

We investigated how correlated tunneling overcomes Coulomb blockade in quantum dot systems. Our findings reveal transport through Kondo correlations, driven by electrostatic interactions between quantum dots.

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Area of Science:

Quantum physics
Condensed matter physics
Nanotechnology

Background:

A system of two quantum dots with strong electrostatic interaction exhibits interdot Coulomb blockade.
This blockade occurs when dots are weakly tunnel-coupled to external leads.

Purpose of the Study:

To experimentally study how correlated tunneling overcomes Coulomb blockade.
To investigate the effect of increasing tunnel coupling to the leads.

Main Methods:

Experimental measurements on a two-quantum-dot system.
Numerical renormalization group (NRG) calculations.
Comparison of experimental results with theoretical calculations using measured parameters.

Main Results:

Demonstration of overcoming Coulomb blockade through correlated tunneling.
Identification of transport mechanisms.
Experimental validation of theoretical models.

Conclusions:

Transport is dominated by Kondo correlations arising from inter-dot electrostatic interactions.
Correlated tunneling plays a crucial role in modulating transport properties in coupled quantum dot systems.