Correlated Exciton Transport in Rydberg-Dressed-Atom Spin Chains

TL;DR

This paper explores how non-local dissipation influences exciton transport in Rydberg atom chains, revealing regimes of coherent, incoherent, and correlated transport with implications for quantum many-body systems.

Contribution

It introduces an effective spin-1/2 model capturing non-local dissipation effects and identifies emergent length scales and correlations in Rydberg excitation transport.

Findings

Identification of transport regimes based on interaction-to-dissipation ratio

Emergence of a preferred hopping distance beyond nearest neighbors

Strong correlations and entanglement due to dissipation in impurity scenarios

Abstract

We investigate the transport of excitations through a chain of atoms with non-local dissipation introduced through coupling to additional short-lived states. The system is described by an effective spin-1/2 model where the ratio of the exchange interaction strength to the reservoir coupling strength determines the type of transport, including coherent exciton motion, incoherent hopping and a regime in which an emergent length scale leads to a preferred hopping distance far beyond nearest neighbors. For multiple impurities, the dissipation gives rise to strong nearest-neighbor correlations and entanglement. These results highlight the importance of non-trivial dissipation, correlations and many-body effects in recent experiments on the dipole-mediated transport of Rydberg excitations.