Raman coupler for a trapped two-component quantum-degenerate Fermi gas

TL;DR

This paper theoretically studies Raman coupling in a trapped two-component Fermi gas, revealing how collisions can suppress dephasing and restore Rabi oscillations, with comparisons to bosonic gases.

Contribution

It demonstrates how two-body collisions can control population dynamics in a Fermi gas, a novel insight into quantum state manipulation.

Findings

Collapses and revivals depend on trap frequency differences.

Two-body collisions can suppress dephasing.

Restoration of Rabi oscillations under certain conditions.

Abstract

We investigate theoretically the Raman coupling between two internal states of a trapped low-density quantum-degenerate Fermi gas. In general, the trap frequencies associated with the two internal states can be different, leading to the onset of collapses and revivals in the population difference of the two internal states. This behavior can be changed drastically by two-body collisions. In particular, we show that under appropriate conditions they can suppress the dephasing leading to the collapse of the population difference, and restore almost full Rabi oscillations between the two internal states. These results are compared and contrasted to those for a quantum-degenerate bosonic gas.