Circuit QED using a semiconductor double quantum dot

TL;DR

This paper demonstrates strong coupling in a semiconductor double quantum dot coupled to a resonator, observing vacuum Rabi splitting and analyzing decoherence mechanisms, advancing quantum information processing in solid-state systems.

Contribution

It reports the first observation of vacuum Rabi splitting in a GaAs double quantum dot coupled to a coplanar waveguide resonator, establishing strong coupling in such systems.

Findings

Observation of vacuum Rabi splitting indicating strong coupling.

Quantitative values for qubit-resonator coupling strength and decoherence rate.

Decoherence primarily due to electron-phonon interactions in GaAs.

Abstract

Vacuum Rabi splitting is observed in a coupled qubit-resonator system consisting of a GaAs double quantum dot and a coplanar waveguide resonator. Derived values of the qubit-resonator coupling strength and the decoherence rate indicate strong coupling, which assures distinct vacuum Rabi oscillation in the system. The amplitude of decoherence is reasonably interpreted in terms of the coupling of electrons to piezoelectric acoustic phonons in GaAs.