Details
| Original language | English |
|---|---|
| Article number | 041 |
| Number of pages | 26 |
| Journal | SciPost Physics |
| Volume | 6 |
| Issue number | 2 |
| Publication status | Published - 7 Jun 2023 |
Abstract
Keywords
- quant-ph, physics.atom-ph
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Physics and Astronomy(all)
- Nuclear and High Energy Physics
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Physics and Astronomy(all)
- Statistical and Nonlinear Physics
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In: SciPost Physics, Vol. 6, No. 2, 041, 07.06.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Higher-order mean-field theory of chiral waveguide QED
AU - Kusmierek, Kasper
AU - Mahmoodian, Sahand
AU - Cordier, Martin
AU - Hinney, Jakob
AU - Rauschenbeutel, Arno
AU - Schemmer, Max
AU - Schneeweiss, Philipp
AU - Volz, Jürgen
AU - Hammerer, Klemens
N1 - Funding Information: This work was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under SFB 1227 ‘DQ-mat’ project A06 - 274200144 and Germany’s Excellence Strategy -EXC-2123 QuantumFrontiers - 390837967, the Alexander von Humboldt Foundation in the framework of the Alexander von Humboldt Professorship endowed by the Federal Ministry of Education and Research, as well as the European Commission under the project DAALI (No.899275). M. C. and M. S. acknowledge support by the European Commission (Marie Skłodowska-Curie IF Grant No. 101029304 and IF Grant No. 896957).
PY - 2023/6/7
Y1 - 2023/6/7
N2 - 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.
AB - 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.
KW - quant-ph
KW - physics.atom-ph
UR - http://www.scopus.com/inward/record.url?scp=85162256041&partnerID=8YFLogxK
U2 - 10.48550/arXiv.2207.10439
DO - 10.48550/arXiv.2207.10439
M3 - Article
VL - 6
JO - SciPost Physics
JF - SciPost Physics
IS - 2
M1 - 041
ER -