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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster I

Q 23.43: Poster

Tuesday, March 12, 2024, 17:00–19:00, Tent B

Superradiant bursts of light from cascaded quantum emitters: Theoretical modelling of photon-photon correlations — Constanze Bach, Christian Liedl, Arno Rauschenbeutel, Philipp Schneeweiss, and •Felix Tebbenjohanns — Department of Physics, Humboldt-Universität zu Berlin, 10099 Berlin, Germany

A fully inverted ensemble of two-level emitters coupled to a common radiation mode emits its energy as a superradiant burst of light [1]. Recently, we have observed experimentally that a similar collective dynamics prevails in the case of a cascaded quantum system [2]. Due to the large number of up to 1200 emitters, the theoretical modeling of our experiments is challenging. Here, we present two novel numerical models with favorable computational complexity that allow us to quantitatively predict the observed burst dynamics. The first model approximates the light field between adjacent atoms as a probabilistic mixture of coherent states. This mixed coherent state approximation (MCSA) correctly predicts the emitted power and the field-field correlations. In addition, we implement the discrete truncated Wigner approximation, which was recently developed in [3]. This inherently stochastic model agrees with the predictions of our MCSA and additionally computes the photon-photon correlations, in agreement with our experimental data. In the future, we plan to test the applicability of our models to other experiments with cascaded quantum systems.

[1] R. H. Dicke, Phys. Rev. 93, 99 (1954).

[2] C. Liedl et al., arXiv:2211.08940 (2023).

[3] C. D. Mink and M. Fleischhauer, arXiv:2305.19829 (2023).

Keywords: cascaded quantum system; superradiance; second-order quantum correlation