Coherent control of individual electron spins in a two dimensional array of quantum dots

TL;DR

This paper demonstrates the first two-dimensional coherent control of individual electron spins in a 3x3 quantum dot array, enabling advanced quantum functionalities essential for scalable quantum computing.

Contribution

It introduces the experimental realization of 2D coherent control of electron spins in a quantum dot array, a key step towards scalable quantum information processing.

Findings

Achieved charge deterministic displacement of electrons.

Performed local spin readout and coherent exchange manipulation.

Demonstrated multi-directional spin shuttling over several microns.

Abstract

The ability to manipulate coherently individual quantum objects organized in arrays is a prerequisite to any scalable quantum information platform. For electron spin qubits, it requires the fine tuning of large arrays of tunnel-coupled quantum dots. The cumulated efforts in linear dot arrays have permitted the recent realization of quantum simulators and multi-electron spin coherent manipulation. However, the two-dimensional scaling of such implementations remains undemonstrated while being compulsory to resolve complex quantum matter problems or process quantum information. Here, we demonstrate the two-dimensional coherent control of individual electron spins in a 3x3 array of tunnel-coupled quantum dots. More specifically, we focus on several key quantum functionalities of such control: charge deterministic displacement, local spin readout, local coherent exchange manipulation between two electron spins trapped in adjacent dots, and coherent multi-directional spin shuttling over distances of several microns. This work lays the foundations for exploiting a two-dimensional array of electron spins for quantum simulation and information processing.