Two-qubit gates using adiabatic passage of the Stark-tuned F\"orster resonances in Rydberg atoms

TL;DR

This paper introduces a method for implementing high-fidelity two-qubit gates using adiabatic passage through Stark-tuned F"orster resonances in Rydberg atoms, enabling controlled quantum operations.

Contribution

It presents a novel scheme utilizing double adiabatic passage with nonlinear chirped pulses for high-fidelity two-qubit gates in Rydberg atom systems.

Findings

Achieved high fidelity in population transfer between Rydberg states.

Demonstrated controlled-Z and controlled-NOT gates using Stark-tuned F"orster resonance.

Analyzed effects of nonlinear chirped pulses on gate performance.

Abstract

We propose schemes of controlled-Z and controlled-NOT gates with ultracold neutral atoms based on deterministic phase accumulation during double adiabatic passage of the Stark-tuned F\"{o}rster resonance of Rydberg states. The effect of deterministic phase accumulation during double adiabatic passage in a two-level quantum system has been analyzed in detail. Adiabatic rapid passage using nonlinearly chirped pulses with rectangle intensity profile has been discussed. Nonlinear time dependence of the energy detuning from the F\"{o}rster resonance is used to achieve a high fidelity of population transfer between Rydberg states. Fidelity of two-qubit gates has been studied with an example of the $90S+96S\to 90P+95P$ Stark-tuned F\"{o}rster resonance in Cs Rydberg atoms.