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Stark-Chirped Rapid Adiabatic Passage in a Multilevel Atom

100%
Radonjić M., Jelenković B.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
476-478
EN
We generalize Stark-chirped rapid adiabatic passage to the case of a multilevel atom. The atom is assumed to have two ground state levels g and f and an excited level e. The adiabatic passage is carried out by resonantly driving the g-e and f-e transitions with time-dependent pump and Stokes fields in the presence of strong far-off-resonant Stark field. Our formalism determines the states that participate in population transfer and is applicable to systems with arbitrary numbers of degenerate states in each level and arbitrary couplings of the g-e and f-e transitions. We give an application to adiabatic passage in Rb atom.
2
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Geometric Phase for Analytically Solvable Driven Time-Dependent Two-Level Quantum Systems

71%
Mendaš I., Burić N., Popović D., Prvanović S., Radonjić M.
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vol. 126
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issue 3
670-673
EN
Geometric phase for novel analytical solutions (Barnes and Das Sarma) of time-dependent two-level quantum systems is discussed, specifically for a general single-axis driving term, which is represented by a function J(t) in the Hamiltonian, and its corresponding evolution operator. It is demonstrated how general results for corresponding phases (total, dynamic and geometric) can be obtained. Using a specific case, it was found that over time in which the driving field is appreciably different from zero, the corresponding geometric phase changes (in the specific example by Δ β ≈ 0.8 radians) thus enabling detection. The results are relevant to qubit control and to quantum computing applications.
3
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Laser Beam Profile Influence on Dark Hanle Resonances in Rb Vapor

61%
Krmpot A., Ćuk S., Nikolić S., Radonjić M., Grujić Z., Jelenković B.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
563-565
EN
Influence of two different laser beam profiles, the Gaussian and the Π (top hat) profile on the resonance line widths and amplitudes in the Hanle electromagnetically induced transparency was studied. The laser beam propagates through the vacuum Rb glass cell. Studies were done at D_1 line for the open ^{87}Rb: F_{g}=2 → F_{e}=1 transition. Hanle electromagnetically induced transparency was measured for the two beam profiles with the same total power and beam diameter and experimental results showed that Gaussian and the top hat profiles give different amplitudes and widths of the Hanle resonances. Resonances obtained from the top hat laser beam profile have lower amplitudes and higher line widths.
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