Rydberg blockade, F\"orster resonances, and quantum state measurements with different atomic species

TL;DR

This paper calculates interspecies Rydberg interactions for Rb and Cs, highlighting F"orster resonances as a promising method for long-range entanglement and high-fidelity quantum state measurements with minimal crosstalk.

Contribution

It provides detailed calculations of interspecies Rydberg interactions and identifies strong F"orster resonances for Rb-Cs, advancing quantum entanglement and measurement techniques.

Findings

Strong F"orster resonances enable effective interspecies coupling.

Interspecies interactions can facilitate high-fidelity quantum measurements.

The study maps F"orster resonances across different quantum states.

Abstract

We calculate interspecies Rydberg-Rydberg interaction strengths for the heavy alkalis Rb and Cs. The presence of strong F\"orster resonances makes interspecies coupling a promising approach for long range entanglement generation. We also provide an overview of the strongest F\"orster resonances for Rb-Rb and Cs-Cs using different principal quantum numbers for the two atoms. We show how interspecies coupling can be used for high fidelity quantum non demolition state measurements with low crosstalk in qubit arrays.