Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session C06: Photoionization, Applications, and General Concepts
10:45 AM–12:45 PM,
Tuesday, June 6, 2023
Room: 206 A
Chair: James Colgan, LANL
Abstract: C06.00010 : Suppressing and tuning-out Raman transitions in multilevel alkali atoms via multi-path interference
12:33 PM–12:45 PM
Presenter:
Arina Tashchilina
(University of Alberta)
Authors:
Arina Tashchilina
(University of Alberta)
Logan W Cooke
(University of Alberta)
Evgeny Moiseev
(Kazan National Research Technical University)
Joseph Lindon
(Univ of Alberta)
Tian Ooi
(University of Alberta)
Nicholas Milson
(University of Alberta)
Lindsay J LeBlanc
(University of Alberta Department of Physics)
To model this, we use an effective Hamiltonian for multilevel atoms addressed by two beams, which drive electric dipole transitions through multiple allowed excited states. These independent pathways can be of similar magnitude and result in interference effects, both constructive and destructive. Our analysis identifies three possible regimes as a function of detuning, polarizations, and the atomic structure: no destructive interference, destructive interference at specific single-photon detuning, and destructive interference at large detunings. We have identified regimes in which coupling tends to zero in the presence of arbitrary laser powers: a tune-out frequency for Raman transitions. We apply our model to alkali atoms, examining the transition strengths between all possible hyperfine levels for both bosonic and fermionic species. Despite the complicated dependence of transition strengths on various parameters, all coupling schemes belong to one of the three regimes.
We discuss how these effects modify the fidelity in various applications, including an atom-based quantum gate and a quantum memory. Finally, we experimentally measure Raman transition strengths in Rb-87 for different coupling polarizations and geometries, and find good agreement with our model.
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