Microwave Emission from Hybridized States in a Semiconductor Charge Qubit

TL;DR

This paper investigates microwave radiation emitted from a biased double quantum dot, revealing how inelastic charge tunneling and state hybridization produce detectable emission resonant with a transmission line, aligning with a rate equation model.

Contribution

It demonstrates the emission characteristics of a semiconductor charge qubit under bias, highlighting the role of hybridized states in microwave emission detection.

Findings

Microwave emission occurs over a broad detuning range.

Emission peaks align with resonance conditions.

Power emission matches the rate equation model.

Abstract

We explore the microwave radiation emitted from a biased double quantum dot due to the inelastic tunneling of single charges. Radiation is detected over a broad range of detuning configurations between the dot energy levels with pronounced maxima occurring in resonance with a capacitively coupled transmission line resonator. The power emitted for forward and reverse resonant detuning is found to be in good agreement with a rate equation model, which considers the hybridization of the individual dot charge states.