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Q: Fachverband Quantenoptik und Photonik
Q 51: Quantum Optical Correlations
Q 51.4: Vortrag
Donnerstag, 14. März 2024, 15:30–15:45, HS 1199
Multiple Quantum Coherence signals by multilevel atoms with internal degeneracy — •Vyacheslav Shatokhin1,2 and Andreas Buchleitner1,2 — 1Physikalisches Institut der Albert-Ludwigs-Universität Freiburg, Freiburg, Germany — 2EUCOR Centre for Quantum Science and Quantum Computing der Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
Manifestations of dipole-dipole interactions in dilute thermal atomic vapors are difficult to sense, because of strong inhomogeneous broadening. Recent experiments with alkali-metal atoms revealed signatures of such interactions in fluorescence detection-based measurements of multiple quantum coherence (MQC) signals. We develop an open quantum systems theory of MQC signals in dilute thermal gases, which allows us to obtain good qualitative agreement with the experimental observations.
In the present talk, we outline the characteristic features of our theory which incorporates the vector character of the atomic dipoles, as well as driving laser pulses of arbitrary strength and polarization, includes the far-field coupling between the dipoles, which prevails in dilute ensembles, and effectively accounts for the atomic motion via a disorder average. We then discuss the impact of the multilevel internal structure of alkali-metal atoms on the fundamental properties of MQC signals.
Keywords: collective effects; dilute thermal atomic gases; ultrafast spectroscopy; fluorescence; multiple scattering