Numerical study of two-body correlation in a 1D lattice with perfect blockade

TL;DR

This paper investigates the dynamics of excitation and two-body correlations in a 1D lattice of pseudoatoms under perfect blockade, revealing rapid decay of quantum correlations with distance and slow decay of total correlations, relevant for Rydberg gases.

Contribution

It provides a numerical analysis of two-body correlations in a 1D lattice with perfect blockade, modeling Rydberg gases with a simplified approach.

Findings

Quantum correlation drops quickly with distance

Total correlation decays slowly over large distances

Results aid understanding of Rydberg gases in strong blockade regime

Abstract

We compute the dynamics of excitation and two-body correlation for two-level "pseudoatoms" in a 1D lattice. We adopt a simplified model where pair excitation within a finite range is perfectly blocked. Each superatom is initially in the ground state, and then subjected to an external driving laser with Rabi frequency satisfying a Poissonian distribution, mimicking the scenario as in Rydberg gases. We find that two-body quantum correlation drops very fast with the distance between pseudoatoms. However, the total correlation decays slowly even at large distance. Our results may be useful to the understanding of Rydberg gases in the strong blockade regime.