Coherent control of atomic excitation using off-resonant strong few-cycle pulses

TL;DR

This paper presents an analytical study of a two-level atomic system driven by off-resonant few-cycle pulses with phase jumps, demonstrating significant enhancement in population transfer through optimized pulse parameters.

Contribution

It provides a closed-form analytical solution for the system's dynamics under off-resonant few-cycle pulses with phase jumps, enabling optimized population transfer.

Findings

Population transfer enhanced by factors of 10^6 to 10^8

Analytical solution for probability amplitude evolution

Optimization of pulse parameters for control

Abstract

We study the dynamics of a two-level system driven by an off-resonant few-cycle pulse which has a phase jump $\phi$ at $t=t_{0}$, in contrast to many cycle pulses, under non rotating-wave approximation (NRWA). We give a closed form analytical solution for the evolution of the probability amplitude $|C_{a} (t)|$ for the upper level. Using the appropriate pulse parameters like phase-jump $\phi$, jump time $t_{0}$, pulse width $\tau$, frequency $\nu$ and Rabi frequency $\Omega_{0}$ the population transfer, after the pulse is gone, can be optimized and for the pulse considered here, enhancement of $10^{6}-10^{8}$ factor was obtained.