SAMOP 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 7: Poster I
Q 7.19: Poster
Montag, 6. März 2023, 16:30–19:00, Empore Lichthof
Higher-order mean-field theory of chiral waveguide QED — •Kasper Jan Kusmierek1, Sahand Mahmoodian1,2, Martin Cordier3, Jakob Hinney4, Arno Rauschenbeutel3,4, Max Schemmer3, Philipp Schneeweiss3,4, Jürgen Volz3,4, and Klemens Hammerer1 — 1Institut für theoretische Phyisk, Leiniz University Hannover, Hannover, Germany — 2Centre for Engineered Quantum Systems, School of Physics, University of Sydney, Sydney, Australia — 3Departement of Physics, Humboldt-Universität zu Berlin, Berlin, Germany — 4Vienna Center for QuantumScience and Technology, Vienna, Austria
Waveguide QED with cold atoms provides a potent platform for the study of non-equi-librium, many-body, and open-system quantum dynamics. Here we apply an improved mean-field theory based on higher-order cumulant expansions to describe the experimentally relevant, but theoretically elusive, regime of weak coupling and strong driving of large ensembles. We determine the transmitted power, squeezing spectra and the degree of second-order coherence, and systematically check the convergence of the results by comparing expansions that truncate cumulants of few-particle correlations at increasing order. This reveals the important role of many-body and long-range correlations between atoms in steady state. Our approach allows to quantify the trade-off between anti-bunching and output power in previously inaccessible parameter regimes. Calculated squeezing spectra show good agreement with measured data, as we present here.