Dissipative stabilization of quantum-feedback-based multipartite entanglement with Rydberg atoms

TL;DR

This paper proposes a quantum feedback scheme using Rydberg atoms in a dissipative cavity to efficiently generate and stabilize multipartite entanglement with simplified control and adjustable states, promising high fidelity.

Contribution

It introduces a novel dissipative feedback method leveraging Rydberg blockade to rapidly stabilize multipartite entanglement with minimal control complexity.

Findings

Single Rydberg excitation stabilizes entanglement efficiently.

Control of entangled state is adjustable via Rabi frequencies.

High fidelity achieved due to Rydberg level's long lifetime.

Abstract

A quantum-feedback-based scheme is proposed for generating multipartite entanglements of Rydberg atoms in a dissipative optical cavity. The Rydberg blockade mechanism efficiently prevents double excitations of the system, which is further exploited to speed up the stabilization of an entangled state with a single Rydberg state excitation. The corresponding feedback operations are greatly simplified, since only one regular atom needs to be controlled during the whole process, irrespective of the number of particles. The form of entangled state is also adjustable via regulating the Rabi frequencies of driving fields. Moreover, a relatively long-life time of the high-lying Rydberg level guarantees a high fidelity in a realistic situation.