Photon-mediated electron transport in hybrid circuit-QED

TL;DR

This paper explores how photons enable electron transport between two quantum dots in a hybrid circuit-QED system, revealing photon-mediated processes through numerical and perturbative analysis.

Contribution

It introduces a detailed analysis of photon-mediated electron transport in a hybrid circuit-QED setup, combining numerical simulations with a recursive perturbation approach.

Findings

Photon-mediated transport occurs under resonance conditions.

Transport in one quantum dot can be facilitated by the other via the cavity.

The study identifies clear signatures of photon-mediated processes.

Abstract

We investigate photon-mediated transport processes in a hybrid circuit-QED structure consisting of two double quantum dots coupled to a common microwave cavity. Under suitable resonance conditions, electron transport in one double quantum dot is facilitated by the transport in the other dot via photon-mediated processes through the cavity. We calculate the average current in the quantum dots, the mean cavity photon occupation, and the current cross-correlations with both a full numerical simulation and a recursive perturbation scheme that allows us to include the influence of the cavity order-by-order in the couplings between the cavity and the quantum dot systems. We can then clearly identify the photon-mediated transport processes.