Cavity-mediated coherent coupling between distant quantum dots

TL;DR

This paper demonstrates a method for coherently coupling distant quantum dots via a cavity in a semiconductor, enabling scalable quantum information processing with minimized cross-talk.

Contribution

It introduces a cavity design utilizing whispering-gallery modes to achieve long-distance coherent coupling between quantum dots in a scalable manner.

Findings

Successful demonstration of cavity-mediated coupling between quantum dots

Reduction of cross-talk in quantum dot interactions

Potential for scalable quantum information architectures

Abstract

Scalable architectures for quantum information technologies require to selectively couple long-distance qubits while suppressing environmental noise and cross-talk. In semiconductor materials, the coherent coupling of a single spin on a quantum dot to a cavity hosting fermionic modes offers a new solution to this technological challenge. Here, we demonstrate coherent coupling between two spatially separated quantum dots using an electronic cavity design that takes advantage of whispering-gallery modes in a two-dimensional electron gas. The cavity-mediated long-distance coupling effectively minimizes undesirable direct cross-talk between the dots and defines a scalable architecture for all-electronic semiconductor-based quantum information processing.