Continuous-Variable Multiplexed Quantum Repeater Networks

TL;DR

This paper proposes a quantum repeater protocol using continuous-variable cat codes and additional resources, significantly boosting secret key rates for long-distance quantum communication.

Contribution

It introduces a novel CV quantum repeater protocol utilizing cat codes and quantum memories, enhancing secret key rates over previous methods.

Findings

Secret key rate increased by several orders of magnitude.

Protocol leverages cat codes and graph states as resources.

Provides insights for designing efficient long-distance quantum networks.

Abstract

Continuous-variable (CV) codes and their application in quantum communication have attracted increasing attention. In particular, one typical CV codes, cat-codes, has already been experimentally created using trapped atoms in cavities with relatively high fidelities. However, when these codes are used in a repeater protocol, the secret key rate (SKR) that can be extracted between two remote users is extremely low. Here we propose a quantum repeater protocol based on cat codes with a few quantum memories or graph states as additional resources. This allows us to considerably increase the secret key rate by several orders of magnitude. Our findings provide valuable insights for designing efficient quantum repeater systems, advancing the feasibility and performance of quantum communication over long distances.