# On the fidelity of quantum information processing with Rydberg atoms: Role of the non-molecular resonances

## TL;DR

This paper investigates how non-molecular resonances, beyond molecular ones, can significantly reduce the fidelity of quantum information processing using Rydberg atoms, emphasizing the need for careful consideration of these effects.

## Contribution

It highlights the importance of non-molecular resonances in Rydberg blockade fidelity, extending previous focus solely on molecular resonances.

## Key findings

- Non-molecular resonances can cause substantial fidelity loss.
- These effects are more significant than previously recognized.
- Careful accounting of non-molecular resonances is essential for quantum computing with Rydberg atoms.

## Abstract

Rydberg blockade of ultracold atoms is considered now as one of the most promising tools for the implementation of quantum computing, but its fidelity can be substantially compromised by detrimental excitation of the neighbouring atoms. This phenomenon has been investigated recently in detail for the particular case of molecular resonances (i.e., resulting in the formation of quasi-bound states). However, as will be shown in the present paper, an even greater effect can come from the non-molecular resonances, which therefore should be taken into account very carefully.