Driving the resonant quantum kicked rotor via extended initial conditions

TL;DR

This paper investigates how extended initial conditions influence the resonances of the quantum kicked rotor, deriving analytical and numerical relations for moments and enabling control of angular momentum direction over time.

Contribution

It provides the first analytical dispersion relation for primary resonances and numerical insights into secondary resonances under extended initial states.

Findings

Analytical dispersion relation for primary resonances.

Dependence of statistical moments on initial distribution shape.

Ability to steer angular momentum direction over time.

Abstract

We study the resonances of the quantum kicked rotor subjected to an extended initial distribution. For the primary resonances we obtain the dispersion relation for the map of this system. We find an analytical dependence of the statistical moments on the shape of the initial distribution. For the secondary resonances we obtain numerically a similar dependence. This allows us to devise an extended initial condition which produces an average angular momentum pointing in a preset direction which increases with time with a preset ratio.