Quantum beating of rubidium: Interference between atomic coherences and long range atom-atom interactions
Reboli, Thomas O
This item's files can only be accessed by the System Administrators group.
Permalink
https://hdl.handle.net/2142/127486
Description
Title
Quantum beating of rubidium: Interference between atomic coherences and long range atom-atom interactions
Author(s)
Reboli, Thomas O
Issue Date
2024-12-04
Director of Research (if dissertation) or Advisor (if thesis)
Eden, J. Gary
Doctoral Committee Chair(s)
Eden, J. Gary
Committee Member(s)
Dragic, Peter
Lorenz, Virginia
Goldschmidt, Elizabeth
Zhao, Yang
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Quantum Beating
Quantum Beat Spectroscopy
Terahertz Quantum Beats
Ultrafast
Alkali
Rubidium
Wave Packet Dynamics
Four Wave Mixing
Wave Packet Interference
Long Range Interactions
Potential Energy Curves
Fano Resonances
Coherence Control
Language
eng
Abstract
Wave packets are established among the $7S_{1/2}$ and $5D_{5/2}$ states of atomic rubidium and are probed via terahertz pump-probe quantum beat spectroscopy. Interferences between the $5D_{5/2}$--$5P_{3/2}$ and $5P_{3/2}$--$5S_{1/2}$ coherences, occurring at 386.4 and 384.2~THz respectively, are observed at their difference frequency of 2.1~THz. Fano windows are observed in the spectra of this difference frequency, which are controllable by varying the pump-probe crossing angle and background rubidium number density. These tunable spectral features have present likely evidence of control over multiple wave packet decay channels, with the ability to selectively drive and interfere these processes through nonlinear excitation mechanisms. To further explore the possible applications of this unique form of spectroscopy, measurements of quantum beats at 18.225~THz occurring from the $7S_{1/2}$ and $5D_{5/2}$ states of rubidium were taken in the presence of varying pressures of argon, krypton, and xenon. Observed broadening and frequency shifting rates were calculated and treated with a classical impact theory. To our knowledge, this is the first application of this theory to a quantum system in general, and allowed for the investigation of rubidium-rare gas interaction forces at both small and large inter-atomic potentials by monitoring quantum beat spectra.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
