Higher-order mean-field theory of chiral waveguide QED
- URL: http://arxiv.org/abs/2207.10439v2
- Date: Mon, 5 Dec 2022 13:42:27 GMT
- Title: Higher-order mean-field theory of chiral waveguide QED
- Authors: Kasper J. Kusmierek, Sahand Mahmoodian, Martin Cordier, Jakob Hinney,
Arno Rauschenbeutel, Max Schemmer, Philipp Schneeweiss, J\"urgen Volz,
Klemens Hammerer
- Abstract summary: Waveguide QED with cold atoms provides a potent platform for the study of non-equilibrium, many-body, and open-system quantum dynamics.
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.
Our approach allows to quantify the trade-off between anti-bunching and output power in previously inaccessible parameter regimes.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- 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.
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