Efficient multiparticle entanglement via asymmetric Rydberg blockade

TL;DR

This paper introduces a method to efficiently generate multiparticle entangled states using Rydberg blockade interactions, achieving high-fidelity Schrödinger cat states in cold Rb atoms.

Contribution

It proposes a novel approach utilizing asymmetric Rydberg blockade interactions for scalable entanglement generation in small atomic ensembles.

Findings

Predicted creation of an 8-particle Schrödinger cat state with 84% fidelity.

Demonstrated the feasibility of state-dependent qubit rotations using weakly interacting Rydberg states.

Provided quantitative analysis supporting the efficiency of the proposed method.

Abstract

We present an efficient method for producing $N$ particle entangled states using Rydberg blockade interactions. Optical excitation of Rydberg states that interact weakly, yet have a strong coupling to a second control state is used to achieve state dependent qubit rotations in small ensembles. On the basis of quantitative calculations we predict that an N=8 Schr\"odinger cat state can be produced with a fidelity of 84% in cold Rb atoms.