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The European Physical Journal D

Efficient population transfer by delayed pulses despite coupling ambiguity

Razmik G. Unanyan, S. Guérin, Bruce W. Shore, Klaas Bergmann

Published Jul 1, 2000• 23 citations
Publisher
DOI
10.1007/s10053-000-8812-2

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The paper examines the effect of irreversible dissipation from the intermediate state on the efficiency of population transfer by partially overlapping delayed pulses in three-state systems. Several general approximations to the final-state population for both the intuitive and counterintuitive pulse sequences are derived. They show that the loss of transfer efficiency is much stronger for the intuitive pulse sequence, as then the intermediate state is significantly populated during the transfer. For the counterintuitive sequence, the damping of the final-state population is found to be exponential for small decay rates and polynomial for large ones; moreover, the range of decay rates, over which the transfer efficiency remains high, is proportional to the squared pulse area. The paper also presents an analytically solvable model, involving smooth delayed pulses, as well as numerical results and analytic approximations for Gaussian pulses.
Abstract We consider coherent population transfer in multilevel quantum systems driven by time-delayed pulse trains. We show how to choose the parameters of the trains so that the population dynamics tracks the behavior of a Λ-type three-level system under stimulated Raman adiabatic passage (STIRAP). Efficient population transfer can be achieved regardless of the order and with or without overlap of the pump and the Stokes sub-pulses of the trains. Generalized STIRAP schemes of population transfer in N -level system with sequential couplings are also examined. The mechanism of the population transfer and the robustness of the proposed schemes are discussed.