Suppression of decoherence effects in the quantum kicked rotor

TL;DR

This paper presents a method to transiently suppress decoherence in the atom-optics quantum kicked rotor by restricting detection to a narrow momentum range, effectively filtering out decoherence effects and preserving quantum coherence.

Contribution

The authors introduce a novel detection-based approach that reduces decoherence effects in the quantum kicked rotor system by selecting a specific momentum interval.

Findings

Decoherence effects are significantly suppressed within the selected momentum range.

Most decohered atoms fall outside the detection window and are not measured, leading to a decoherence-free signal.

The method enhances the coherence time in atom-optics experiments of the kicked rotor.

Abstract

We describe a method allowing transient suppression of decoherence effects on the atom-optics realization of the kicked rotor. The system is prepared in an initial state with a momentum distribution concentrated in an interval much sharper than the Brillouin zone; the measure of the momentum distribution is restricted to this interval of quasimomenta: As most of the atoms undergoing decoherence processes fall outside this detection range and thus are not detected, the measured signal is effectively decoherence-free.