Pulse-driven near-resonant quantum adiabatic dynamics: Lifting of quasidegeneracy

Pulse-driven near-resonant quantum adiabatic dynamics: Lifting of quasidegeneracy

We study the quantum dynamics of a two-level system driven by a pulse that starts near-resonant for small amplitudes, yielding nonadiabatic evolution, and induces an adiabatic evolution for larger amplitudes. This problem is analyzed in terms of lifting of degeneracy for rising amplitudes. It is sol...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Vol. 70; no. 4
Main Authors: Yatsenko, L. P., Guérin, S., Jauslin, H. R.
Format: Journal Article
Language:English
Published: United States 01-10-2004
Subjects:
AMPLITUDES
ATOMIC AND MOLECULAR PHYSICS
ENERGY LEVELS
EVOLUTION
EXCITATION
MATHEMATICAL SOLUTIONS
OPTICAL PUMPING
OPTICS
PULSES
QUANTUM MECHANICS
STARK EFFECT
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Summary:We study the quantum dynamics of a two-level system driven by a pulse that starts near-resonant for small amplitudes, yielding nonadiabatic evolution, and induces an adiabatic evolution for larger amplitudes. This problem is analyzed in terms of lifting of degeneracy for rising amplitudes. It is solved exactly for the case of linear and exponential rising. Approximate solutions are given in the case of power-law rising. This allows us to determine approximative formulas for the line shape of resonant excitation by various forms of pulses such as truncated trigonometric pulses. We also analyze and explain the various superpositions of states that can be obtained by the half Stark chirped rapid adiabatic passage process.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.70.043402