Neutral atom entanglement using adiabatic Rydberg dressing

TL;DR

This paper explores a method for implementing high-fidelity two-qubit entangling gates with neutral atoms using adiabatic Rydberg dressing and two-photon transitions, enabling fast gates beyond the Rydberg blockade regime.

Contribution

It introduces a two-photon adiabatic dressing protocol for neutral atoms that achieves high-fidelity entangling gates without requiring ultra-violet lasers and works beyond the perfect Rydberg blockade.

Findings

Achieves entangling gate fidelities comparable to one-photon excitation.

Enables fast high-fidelity gates beyond the Rydberg blockade radius.

Maintains limited population in doubly-excited Rydberg states.

Abstract

We revisit the implementation of a two-qubit entangling gate, the M{\o}lmer-S{\o}rensen gate, using the adiabatic Rydberg dressing paradigm for neutral atoms as studied in [Phys. Rev. A 101, 030301 (R) (2020)]. We study the implementation of rapid adiabatic passage using a two-photon transition, which does not require the use of an ultra-violet laser, and can be implemented using only amplitude modulation of one field with all laser frequencies fixed. We find that entangling gate fidelities, comparable to the one-photon excitation, are achievable with the two-photon excitation. Moreover, we address how the adiabatic dressing protocol can be used to implement entangling gates outside the regime of a perfect Rydberg blockade. We show that using adiabatic dressing we can achieve scaling of gate fidelity set by the fundamental limits to entanglement generated by the Rydberg interactions while simultaneously retaining a limited population in the doubly-excited Rydberg state. This allows for fast high fidelity gates for atoms separated beyond the blockade radius.