Promotionsvortrag Physik: „Spatio-temporal correlations of ensembles of multi-level atoms“

Ankündigung des Promotionsvortrags von: Herrn Manuel Bojer

In 1956, a remarkable and controversially discussed experiment was conducted by R. Hanbury Brown and R. Q. Twiss. Their goal was to measure the angular size of several stars in the radio frequency domain using two antennas. Mathematically, this measurement involves not only a cor-relation of two, but four optical field amplitudes. Inspired by these experiments Robert J. Glauber developed a fully quantum-mechanical description of higher-order coherence in 1963 (Nobel Prize 2005).

In this talk, we first study a system of dipole-dipole interacting atoms and use the concept of optical coherence in terms of higher-order correlation functions to extract information about external as well as internal degrees of freedom of the atomic system, e.g., the distance of the atoms even far below the Abbe limit.

In addition, we present new investigations on the statistical moments of the emitted light of inde-pendent non-interacting atoms. In particular, we derive two conditions an atomic ensemble needs to obey to display thermal statistics, in terms of the atom number as well as the ratio of coherent and incoherent light emission.

Finally, we consider a system of weakly driven non-interacting atoms and show that depending on the observation direction, a plethora of different light statistics ranging from superbunching to an-tibunching can be observed. Thereby, the heights of the superbunching peaks and the depths of the antibunching dips can be controlled by the saturation parameter.

(Vortrag auf Englisch)

Dem Vortrag schließt sich eine Diskussion von 15 Minuten an. Vortrag und Diskussion sind öffentlich. Diesen Verfahrensteilen folgt ein nicht öffentliches Rigorosum von 45 Minuten.