Theory Seminar:  Quantum simulation with cold fermions

Philipp Preiss (MPQ Many Body Systems Disvision)
Interacting Fermi systems in two dimensions display intriguing phenomena such as quantum magnetism, pseudogap physics, and high temperature superfluidity. Quantum simulators based on ultracold gases can now quantitatively address the physics of such systems in clean and tunable settings.
 

Philipp Preiss, MPQ Many Body Systems Division
Herbert-Walther-lecture hall (G 0.25) ans via Zoom
Wednesday, 2nd November 2022, 3:00pm (MEZ)

Abstract:

Interacting Fermi systems in two dimensions display intriguing phenomena such as quantum magnetism, pseudogap physics, and high temperature superfluidity. Quantum simulators based on ultracold gases can now quantitatively address the physics of such systems in clean and tunable settings.
In this talk, I will discuss two sets of experiments that probe ultracold Fermi systems at the microscopic level of individual particles.
I will first report on experiments on few-Fermion systems in the continuum [1-3]. Surprisingly, we find that characteristic features of many-body Fermi gases can already be seen with no more than a dozen particles: we observe collective excitations that are the few-body precursor of the Higgs amplitude mode of a superfluid and directly image Cooper-pair-like momentum correlations.
In the latter part of the talk, I will introduce the new project FermiQP at MPQ. Our hybrid simulator will combine analog quantum simulation of the Fermi-Hubbard model with a digital universal gate set and enable new experiments at the interface between quantum information and condensed matter physics.
 

[1] Bayha, Holten et al., Nature 587, 583 (2020)
[2] Holten et al., Phys. Rev. Lett. 126, 020401 (2021)
[3] Holten et al., Nature 606, 287 (2022)