Higher-order mean-field theory of chiral waveguide QED

verfasst von
Kasper Kusmierek, Sahand Mahmoodian, Martin Cordier, Jakob Hinney, Arno Rauschenbeutel, Max Schemmer, Philipp Schneeweiss, Jürgen Volz, Klemens Hammerer
Abstract

Waveguide QED with cold atoms provides a potent platform for the study of non-equilibrium, many-body, and open-system quantum dynamics. Even with weak coupling and strong photon loss, the collective enhancement of light-atom interactions leads to strong correlations of photons arising in transmission, as shown in recent experiments. 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.

Organisationseinheit(en)
Institut für Theoretische Physik
Externe Organisation(en)
Humboldt-Universität zu Berlin (HU Berlin)
Columbia University
Universität Sydney
Technische Universität Wien (TUW)
Typ
Artikel
Journal
SciPost Physics
Band
6
Anzahl der Seiten
26
Publikationsdatum
07.06.2023
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Physik der kondensierten Materie, Kern- und Hochenergiephysik, Atom- und Molekularphysik sowie Optik, Statistische und nichtlineare Physik
Elektronische Version(en)
https://doi.org/10.48550/arXiv.2207.10439 (Zugang: Offen)
https://doi.org/10.21468/SciPostPhysCore.6.2.041 (Zugang: Offen)