Effects of interactions on the generalized Hong-Ou-Mandel effect

TL;DR

This paper numerically studies how interactions affect the generalized Hong-Ou-Mandel effect in bosonic particles, revealing fermionization effects and the impact of input asymmetries for different interaction types and particle numbers.

Contribution

It provides the first detailed numerical analysis of interaction effects on the generalized HOM effect for multiple bosons with a delta barrier, including attractive interactions.

Findings

Fermionization effect observed for both attractive and repulsive interactions.

Interaction strength increases smear out the HOM dip.

Input asymmetries influence the HOM interference pattern.

Abstract

We numerically investigate the influence of interactions on the generalized Hong-Ou-Mandel (HOM) effect for bosonic particles and show results for the cases of $N=2$, $N=3$ and $N=4$ bosons interacting with a beam splitter, whose role is played by a $\delta$-barrier. In particular, we focus on the effect of attractive interactions and compare the results with the repulsive case, as well as with the analytically available results for the non-interacting case (that we use as a benchmark). We observe a fermionization effect both for growing repulsive and attractive interactions, i.e., the dip in the HOM coincidence count is progressively smeared out, for increasing interaction strengths. The role of input asymmetries is also explored.