Autler-Townes Doublet observation via a Cooper-Pair Beam Splitter

TL;DR

This paper demonstrates how electronic transport measurements can reveal the Autler-Townes doublet in a nanodevice composed of quantum dots and a superconductor, using a density matrix approach.

Contribution

It introduces a novel method to observe the Autler-Townes doublet through electronic transport in a hybrid quantum dot system, combining optical pumping and Andreev reflection.

Findings

Signatures of Autler-Townes doublet observed in photocurrent measurements.

Effective coupling via crossed Andreev reflection influences optical properties.

Transient and stationary regimes both show clear doublet features.

Abstract

We present a proof-of-principle of how electronic transport measurements permits the observation of the Autler-Townes doublet, an optical property of nanodevices. The quantum physical system consists of one optically pumped quantum dot, a second auxiliary quantum dot, and a superconductor lead which provides an effective coupling between the dots via crossed Andreev reflection. Electrodes, working as source and drain, acts as nonequilibrium electronic reservoirs. Our calculations of the photocurrent at both, transient and stationary regimes, obtained using a density matrix formalism for open quantum systems, shows signatures of the formation of the Autler-Townes doublet, caused by the interplay between the optical pumping and the crossed Andreev reflection.