Adiabatic passage of radiofrequency-assisted Forster resonances in Rydberg atoms for two-qubit gates and generation of Bell states

TL;DR

This paper introduces a novel method using adiabatic passage across radiofrequency-assisted F"{o}rster resonances to entangle Rydberg atoms, enhancing robustness against distance fluctuations for quantum computing applications.

Contribution

It proposes a new entanglement scheme based on adiabatic passage and F"{o}rster resonances, differing from blockade-based methods, to improve fidelity stability.

Findings

Demonstrates a deterministic phase shift in two-atom states

Reduces sensitivity to interatomic distance fluctuations

Proposes a feasible method for high-fidelity Bell state generation

Abstract

High-fidelity entangled Bell states are of great interest in quantum physics. Entanglement of ultracold neutral atoms in two spatially separated optical dipole traps is promising for implementation of quantum computing and quantum simulation and for investigation of Bell states of material objects. We propose a new method to entangle two atoms via long-range Rydberg-Rydberg interaction. Alternatively to previous approaches, based on Rydberg blockade, we consider radiofrequency-assisted Stark-tuned F\"{o}rster resonances in Rb Rydberg atoms. To reduce the sensitivity of the fidelity of Bell states to the fluctuations of interatomic distance, we propose to use the double adiabatic passage across the radiofrequency-assisted Stark-tuned F\"{o}rster resonances, which results in a deterministic phase shift of the two-atom state.