Nonequilibrium interactions between two quantum circuits

TL;DR

This paper investigates how nonequilibrium energy transfer occurs between two electrically isolated quantum nanostructures, demonstrating detection of energy quanta up to ~1 meV through various quantum configurations.

Contribution

It provides experimental evidence of energy transfer mechanisms via nonequilibrium phonons between quantum circuits, expanding understanding of quantum energy interactions.

Findings

Detection of energy quanta up to ~1 meV in quantum circuits

Energy transfer consistent with nonequilibrium acoustic phonons

Detection possible with bias voltages in the mV range

Abstract

We briefly overview our recent results on nonequilibrium interactions between neighboring electrically isolated nanostructures. One of the nanostructures is represented by an externally biased quantum point contact (drive-QPC), which is used to supply energy quanta to the second nanostructure (detector). Absorption of these nonequilibrium quanta of energy generates a dc-current in the detector, or changes its differential conductance. We present results for a double quantum dot, a single quantum dot or a second QPC placed in the detector circuit. In all three cases a detection of quanta with energies up to ~1 meV is possible for bias voltages across the drive-QPC in the mV range. The results are qualitatively consistent with an energy transfer mechanism based on nonequilibrium acoustic phonons.