Quantum interface of an electron and a nuclear ensemble.

DA Gangloff, G Éthier-Majcher, C Lang, EV Denning, JH Bodey, DM Jackson, E Clarke, M Hugues, C Le Gall, M Atatüre

OAI: oai:www.repository.cam.ac.uk:1810/290125 • DOI: 10.17863/CAM.37350

Coherent excitation of an ensemble of quantum objects underpins quantum many-body phenomena and offers the opportunity to realize a memory that stores quantum information. Thus far, a deterministic and coherent interface between a spin qubit and such an ensemble has remained elusive. In this study, we first used an electron to cool the mesoscopic nuclear spin ensemble of a semiconductor quantum dot to the nuclear sideband-resolved regime. We then implemented an all-optical approach to access individual quantized electronic-nuclear spin transitions. Lastly, we performed coherent optical rotations of a single collective nuclear spin excitation-a spin wave. These results constitute the building blocks of a dedicated local memory per quantum-dot spin qubit and promise a solid-state platform for quantum-state engineering of isolated many-body systems.

quant-ph quant-ph cond-mat.mes-hall