# Freiburg 2019 – wissenschaftliches Programm

## Sitzungen | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

# FM: Fall Meeting

## FM 41: Poster: Quantum Sensing

### FM 41.16: Poster

### Dienstag, 24. September 2019, 16:30–18:30, Tents

**Master equation for enseble of multilevel atoms** — •Aleksei Konovalov, Andreas Buchheit, and Giovanna Morigi — Universität des Saarlandes, Saarbrücken, Germany

The development of stable atomic clocks for quantum metrology requires an accurate knowledge of the spectroscopic properties of atomic ensembles. Line shifts due to quantum interference in the decay channels of single atoms are measurable [1] and shall be reliably described by a master equation formalism. In this work we present a master equation formalism which systematically includes the interference effects in the incoherent decay of an ensemble of multilevel atoms. This master equation has the Lindblad form. In the single-atom limit it can be reduced to the master equation for a single atom including the cross damping terms, which lead to quantum interference in dissipative process [2], while for two-level atoms it reproduces the well-known master equation for superradiance [3]. We determine the spectroscopic signals for an ensemble of Hydrogen atoms and show that the interplay between crossdamping terms and superradiant decay can lead to significant modifications of the line shapes.

References

[1] N. Kolachevsky, A. Beyer, L. Maisenbacher et al, AIP Conference Proceedings 1936, 020015 (2018) [2] Andreas Alexander Buchheit and Giovanna Morigi, PHYSICAL REVIEW A 94, 042111 (2016) [3] M. Gross, S. Haroche, Superradiance: an essay on the theory of collective spontaneous emission, PHYSICS REPORTS 93, No 5 (1982) 301-396