# Kolloquien

### Sommersemester 2024

URL to ICS calendar of this seminar

Kirchhoff-Institut für Physik, Otto-Haxel-Hörsaal

Friday 17:15

Talks
~~14.6.2024 17:00~~

KIP, INF 227, Hörsaal 1

Over the last twenty years, physicists have learned to manipulate individual quantum
objects: atoms, ions, molecules, quantum circuits, electronic spins... It is now possible to
build "atom by atom" a synthetic quantum matter. By controlling the interactions between
atoms, one can study the properties of these elementary many-body systems: quantum
magnetism, transport of excitations, superconductivity... and thus understand more deeply
the N-body problem. More recently, it was realized that these quantum machines may
find applications in the industry, such as finding the solution of combinatorial
optimization problems.

This seminar will present an example of a synthetic quantum system, based on laser-
cooled ensembles of individual atoms trapped in microscopic optical tweezer arrays. By
exciting the atoms into Rydberg states, we make them interact, even at distances of more
than ten micrometers. In this way, we study the magnetic properties of an ensemble of
more than a hundred interacting ½ spins, in a regime in which simulations by usual
numerical methods are already very challenging. Some aspects of this research led to the
creation of a startup, Pasqal.