

Microsoft Teams  Seminars@DIFI  cod. hzo4tgo

Seminar
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Trapped Rydberg ions represent a flexible platform for quantum simulation and information processing. They combine a high degree of control over electronic and vibrational degrees of freedom, typical of trapped ion setups, with the possibility to individually excite ions to highlying Rydberg levels, allowing one to engineer strong interactions between pairs of excited ions.
In the first part of the talk, I will show how the coupling between Rydberg pair interactions and collective motional modes can be exploited to realise effective longrange multibody interactions, consisting of two, three, and fourbody terms. By focusing on an experimentally feasible quasi onedimensional setup of Sr Rydberg ions, I will demonstrate that multibody interactions are enhanced by the emergence of a soft mode associated, e.g., with a structural phase transition. This has a striking impact on manybody electronic states and results, for example, in a threebody antiblockade effect.
The second part of the presentation will illustrate the capabilities of trapped Rydberg ions in simulating the quantum behaviour in the neighbourhood of a conical intersection. Conical intersections occur at the degeneracy points between two (or more) electronic potential energy surfaces and are a paradigmatic example of the nonadiabatic processes characterising the excited dynamics of large molecules. I will show how, thanks to the interplay between large polarizability and strong dipolar exchange interactions, trapped Rydberg ions make it possible to engineer tunable conical intersections and to study their ensuing dynamics in a highly controllable environment. In particular, I will demonstrate how the presence of a conical intersection affects both the nuclear and electronic dynamics leading, for instance, to the inhibition of the nuclear motion.