Seminar Schedule

Find upcoming seminars below. All talks are also announced via our mailing list and are also available via a google calendar (ical). Previous talks as well as a copy of the slides will be made available for the foreseeable future on the VIDEOS page.

Thu 2021-07-22 17:00 CEST

Quantum Science Seminar #57: Quantum Dots
Mete Atatüre
University of Cambridge
Cambridge — United Kingdom
Nuclear spins in a semiconductor quantum dot: through the looking-glass, and what we found there
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.

Summer Break

The Quantum Science Seminar will take a Summer break during August. The next seminar will be on September 23rd, 2021.