Quantum repeaters based on Rydberg-blockade coupled atomic ensembles

TL;DR

This paper introduces a quantum repeater scheme using Rydberg-blockade coupled atomic ensembles, achieving higher entanglement distribution rates through deterministic operations and multiplexing.

Contribution

It presents a novel quantum repeater protocol leveraging Rydberg blockade for improved entanglement distribution and multiplexing capabilities.

Findings

Higher entanglement distribution rates by orders of magnitude.

Deterministic entanglement swapping using Rydberg-based two-qubit gates.

Implementation of temporal multiplexing for faster entanglement distribution.

Abstract

We propose a scheme for realizing quantum repeaters with Rydberg-blockade coupled atomic ensembles, based on a recently proposed collective encoding strategy. Rydberg-blockade mediated two-qubit gates and efficient cooperative photon emission are employed to create ensemble-photon entanglement. Thanks to deterministic entanglement swapping operations via Rydberg-based two-qubit gates, and to the suppression of multi-excitation errors by the blockade effect, the entanglement distribution rate of the present scheme is higher by orders of magnitude than the rates achieved by other ensemble-based repeaters. We also show how to realize temporal multiplexing with this system, which offers an additional speedup in entanglement distribution.