Excitation transport through Rydberg dressing

TL;DR

This paper introduces a method to create long-range interactions between alkali atoms in different hyperfine ground states using off-resonant Rydberg dressing, enabling coherent quantum state transfer with reduced ionization risk.

Contribution

It develops an effective Hamiltonian for Rydberg-dressed ground states that accurately models multi-atom dynamics, offering a new approach for quantum information processing.

Findings

Effective Hamiltonian accurately describes up to 5 atoms.

Rydberg dressing reduces ionization and allows tunable interactions.

Demonstrates coherent electronic state migration between atoms.

Abstract

We show how to create long range interactions between alkali-atoms in different hyper-fine ground states, allowing coherent electronic quantum state migration. The scheme uses off resonant dressing with atomic Rydberg states, exploiting the dipole-dipole excitation transfer that is possible between those. Actual population in the Rydberg state is kept small. Dressing offers large advantages over the direct use of Rydberg levels: It reduces ionisation probabilities and provides an additional tuning parameter for life-times and interaction-strengths. We present an effective Hamiltonian for the ground-state manifold and show that it correctly describes the full multi-state dynamics for up to 5 atoms.