Complete population transfer in a three-state quantum system by a train of pairs of coincident pulses

Details Complete population transfer in a three-state quantum system by a train of pairs of coincident pulses Complete population transfer in a three-state quantum system by a train of pairs of coincident pulses

2012-01-04

arxiv.org/abs/1201.1029v1

Physics

Quantum Physics

Scientific paper

A technique for complete population transfer between the two end states $\ket{1}$ and $\ket{3}$ of a three-state quantum system with a train of $N$ pairs of resonant and coincident pump and Stokes pulses is introduced. A simple analytic formula is derived for the ratios of the pulse amplitudes in each pair for which the maximum transient population $P_2(t)$ of the middle state $\ket{2}$ is minimized, $P_2^{\max}=\sin^2(\pi/4N)$. It is remarkable that, even though the pulses are on exact resonance, $P_2(t)$ is damped to negligibly small values even for a small number of pulse pairs. The population dynamics resembles generalized $\pi$-pulses for small $N$ and stimulated Raman adiabatic passage for large $N$ and therefore this technique can be viewed as a bridge between these well-known techniques.

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