Transport Spectroscopy of a Spin-Coherent Dot-Cavity System

TL;DR

This paper demonstrates the creation of extended spin-singlet states in a coupled quantum dot-cavity system within a high-mobility 2D electron gas, advancing quantum coherence control for quantum information applications.

Contribution

It introduces a novel mesoscopic dot-cavity system that achieves strong coupling and extended quantum states, enabling nonlocal spin interactions for quantum computing.

Findings

Extended spin-singlet states observed in the coupled system

Strong dot-cavity coupling achieved in a high-mobility 2D electron gas

Potential for nonlocal spin coupling in quantum information processing

Abstract

Quantum engineering requires controllable artificial systems with quantum coherence exceeding the device size and operation time. This can be achieved with geometrically confined low-dimensional electronic structures embedded within ultraclean materials, with prominent examples being artificial atoms (quantum dots) and quantum corrals (electronic cavities). Combining the two structures, we implement a mesoscopic coupled dot-cavity system in a high-mobility two-dimensional electron gas, and obtain an extended spin-singlet state in the regime of strong dot-cavity coupling. Engineering such extended quantum states presents a viable route for nonlocal spin coupling that is applicable for quantum information processing.