Supporting multiple entanglement flows through a continuous-variable quantum repeater

TL;DR

This paper proposes a method for supporting multiple continuous-variable entanglement flows in quantum networks using a quantum repeater with noiseless linear amplification and dual homodyne detection, optimizing hub placement for improved rates.

Contribution

It introduces a model for multiple entanglement flows through a quantum repeater with asymmetric losses and identifies optimal hub placements to enhance entanglement distribution rates.

Findings

Optimal hub placement improves entanglement rates.

Asymmetric losses are effectively managed in the model.

Multiple entanglement flows can be supported simultaneously.

Abstract

Quantum repeaters are critical to the development of quantum networks, enabling rates of entanglement distribution beyond those attainable by direct transmission. We consider multiple continuous-variable, squeezed light-based entanglement flows through a repeater involving noiseless linear amplification and dual homodyne detection. By analyzing a single-repeater-enhanced channel model with asymmetric losses across the repeater, we determine optimal placements of the central repeater hub in a 4-user hub-and-spoke network such that the rate of each entanglement flow through the hub is enhanced.