Experimental demonstration of coherent control in quantum chaotic systems

TL;DR

This paper experimentally demonstrates how coherent control can manipulate quantum chaotic systems, specifically by controlling molecular rotational states through laser pulses, highlighting quantum-classical differences.

Contribution

First experimental demonstration of coherent control in a quantum chaotic system using ultrashort laser pulses on diatomic molecules.

Findings

Control of molecular rotational states via phase adjustments

Localization of angular momentum in quantum chaotic systems

Control sensitivity to kicking field parameters

Abstract

We experimentally demonstrate coherent control of a quantum system, whose dynamics is chaotic in the classical limit. Interaction of diatomic molecules with a periodic sequence of ultrashort laser pulses leads to the dynamical localization of the molecular angular momentum, a characteristic feature of the chaotic quantum kicked rotor. By changing the phases of the rotational states in the initially prepared coherent wave packet, we control the rotational distribution of the final localized state and its total energy. We demonstrate the anticipated sensitivity of control to the exact parameters of the kicking field, as well as its disappearance in the classical regime of excitation.