Local and spatially extended sub-Poisson atom number fluctuations in optical lattices

TL;DR

This paper reports the observation of sub-Poissonian atom number fluctuations in optical lattices, demonstrating quantum correlations that persist across multiple sites and large samples, aligning with theoretical predictions.

Contribution

It provides experimental evidence of sub-Poissonian fluctuations in ultracold bosonic atoms within optical lattices, confirming theoretical models and showing robustness of correlations.

Findings

Sub-Poissonian on-site and inter-site atom number fluctuations observed.

Experimental results agree with truncated Wigner approximation predictions.

Correlations persist over large spatially extended samples.

Abstract

We demonstrate that ultracold interacting bosonic atoms in an optical lattice show sub-Poissonian on-site and inter-site atom number fluctuations. The experimental observations agree with numerical predictions of the truncated Wigner approximation. The correlations persist in the presence of multi-mode atom dynamics and even over large spatially extended samples involving several sites and large populations.