Dephasing of multiparticle Rydberg excitations for fast entanglement generation

TL;DR

This paper proposes a method for rapid entanglement generation using Rydberg dephasing in atomic ensembles, leveraging microwave-induced interactions and long-wavelength spin-waves for efficient quantum information processing.

Contribution

It introduces a novel approach combining microwave mixing and four-photon excitation to achieve fast, scalable entanglement in large atomic ensembles.

Findings

Dephasing mechanism scales approximately exponentially with system size.

Long coherence times are achieved through four-photon excitation.

The method enables fast entanglement generation in Rydberg systems.

Abstract

An approach to fast entanglement generation based on Rydberg dephasing of collective excitations (spin-waves) in large, optically thick atomic ensembles is proposed. Long-range $1/r^3$ atomic interactions are induced by microwave mixing of opposite-parity Rydberg states. Required long coherence times are achieved via four-photon excitation and read-out of long wavelength spin-waves. The dephasing mechanism is shown to have favorable, approximately exponential, scaling for entanglement generation.