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

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Phonon-mediated nonequilibrium interaction between nanoscale devices.

G J Schinner¹, H P Tranitz, W Wegscheider

¹Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany.

Physical Review Letters

|June 13, 2009

Summary

This summary is machine-generated.

Interface acoustic phonons mediate interactions between mesoscopic devices in two-dimensional electron systems. This phonon-mediated interaction is crucial for decoherence in solid-state quantum circuits.

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Area of Science:

Condensed Matter Physics
Mesoscopic Physics
Quantum Electronics

Background:

Two-dimensional electron systems (2DES) are fundamental in mesoscopic device research.
Understanding interactions within 2DES is key to advancing quantum technologies.
Phonon-mediated interactions can significantly impact electron behavior in confined systems.

Purpose of the Study:

To investigate interactions between mesoscopic devices mediated by interface acoustic phonons.
To explore the role of these interactions in the decoherence of quantum circuits.

Main Methods:

Phonon spectroscopy was employed to study the interactions.
Ballistic electrons from a quantum point contact emitted phonons, which were reabsorbed by a nearby 2DES.
Energy spectroscopy using a tunable electrostatic barrier in a separate detector circuit analyzed excited electrons.

Main Results:

The transferred energy was found to be limited by a maximum value.
This maximum energy corresponds to Fermi-level electrons excited and backscattered by interface phonons.
Evidence of phonon-mediated energy transfer between mesoscopic devices was observed.

Conclusions:

Phonon-mediated interactions are significant in two-dimensional electron systems.
These interactions play a critical role in the decoherence of solid-state-based quantum circuits.
The findings provide insights into decoherence mechanisms relevant for quantum computing and electronics.