Implementing a neutral-atom controlled-phase gate with a single Rydberg pulse

TL;DR

This paper proposes a simplified method for implementing high-fidelity neutral-atom controlled-phase gates using a single Rydberg pulse, avoiding complex addressing or adiabatic steps, and achieving over 99% fidelity.

Contribution

It introduces a novel, experimentally feasible scheme for two-qubit gates that is simpler and more practical than existing methods, utilizing only one Rydberg pulse.

Findings

Achieves gate fidelity higher than 0.99 with realistic parameters.

Simplifies implementation by eliminating the need for individual atom addressing.

Avoids adiabatic procedures, reducing experimental complexity.

Abstract

One can implement fast two-qubit entangling gates by exploiting the Rydberg blockade. Although various theoretical schemes have been proposed, experimenters have not yet been able to demonstrate two-atom gates of high fidelity due to experimental constraints. We propose a novel scheme, which only uses a single Rydberg pulse illuminating both atoms, for the construction of neutral-atom controlled-phase gates. In contrast to the existing schemes, our approach is simpler to implement and requires neither individual addressing of atoms nor adiabatic procedures. With parameters estimated based on actual experimental scenarios, a gate fidelity higher than 0.99 is achievable.