Quantum Science Seminar #57

Nuclear spins in a semiconductor quantum dot: through the looking-glass, and what we found there

Mete Atatüre - University of Cambridge (Cambridge - United Kingdom)

Optically active spins in solids are often considered prime candidates for scalable and feasible quantum-optical devices. Numerous material platforms including diamond, semiconductors, and atomically thin 2d materials are investigated, where each platform brings their own advantages along with their challenges. Semiconductor quantum dots are the current state-of-the-art for optical properties such as tuneability, brightness and indistinguishability. Their nickname "artificial atom" was coined historically to highlight how similar they can be to isolated single atoms, but in fact they are far from the realisation of a simple two-level system. The inherently mesoscopic nature of a quantum dot leads to a multitude of dynamics between spins, charges, vibrations, and light. In particular, it offers a unique realisation of a tripartite interface between light, a single proxy qubit (electron spin) and an isolated spin ensemble (nuclei). Ability to control these constituents and their mutual interactions creates opportunities to realise an optically controllable ensemble of ~50,000 spins. In this talk, I will present the two-decade journey from treating the quantum dot nuclei as noise to the observation of their collective magnon modes and eventually to their tuneable quantum correlations, all witnessed via a single electron spin driven by light.


[1] Bernhard Urbaszek, Xavier Marie, Thierry Amand, Olivier Krebs, Paul Voisin, Patrick Maletinsky, Alexander Högele, and and Atac Imamoglu

"Nuclear spin physics in quantum dots: An optical investigation"

Reviews of Modern Physics 85, 79 (2013)

[2] D. A. Gangloff, G. Éthier-Majcher, C. Lang, E. V. Denning, J. H. Bodey, D. M. Jackson, E. Clarke, M. Hugues, C. Le Gall, and M. Atatüre

"Quantum interface of an electron and a nuclear ensemble"

Science 264, 62 (2019)

[3] D. M. Jackson, D. A. Gangloff, J. H. Bodey, L. Zaporski, C. Bachorz, E. Clarke, M. Hugues, C. Le Gall, and M. Atatüre

"Quantum sensing of a coherent single spin excitation in a nuclear ensemble"

Nature Physics 17, 585 (2021)

Access the live talk at 17.00 CEST or the recording afterwards via this link:

Quantum Science Seminar #57 - Mete Atatüre

Here you can find the recording of the last lecture by Paula Garcia Molina, Gadi Afek and Chi Shu.

Quantum Science Seminar #56 - Hot Topics

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