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Quantum Information and Measurement (QIM)

Quantum control of two-level atoms with far-detuned few-cycle pulses - an analytical case

Bing Zeng, Lingze Duan

Published Jan 1, 2021• 0 citations
Publisher

Abstract

A two-level system driven by a far-off-resonance few-cycle square pulse is theoretically analyzed. A closed-form solution well-matched with simulation is presented without using the rotating wave approximation.
DOI
10.1364/qim.2021.th2b.3

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We investigate the problem of population transfer in a two-states system driven by an external electromagnetic field featuring a few cycles, until the extreme limit of two or one cycle. Taking the physical constraint of zero-area total field into account, we determine strategies leading to ultrahigh-fidelity population transfer despite the failure of the rotating wave approximation. We specifically implement adiabatic passage based on adiabatic Floquet theory for a number of cycles as low as 2.5 cycles, finding and making the dynamics follow an adiabatic trajectory connecting the initial and targeted states. Nonadiabatic strategies with shaped or chirped pulses, extending the π-pulse regime to two- or single-cycle pulses, are also derived.