Boosting end-to-end entanglement fidelity in quantum repeater networks via hybridized strategies

TL;DR

This paper demonstrates that hybrid error management strategies combining entanglement purification and quantum error correction can significantly improve the fidelity of Bell pairs in quantum repeater networks, surpassing security thresholds.

Contribution

It introduces hybrid strategies that outperform individual methods in achieving high-fidelity entanglement, with specific error regimes identified for their applicability.

Findings

Hybrid strategies produce higher fidelity Bell pairs than single methods.

Applicable in regimes with specific gate and measurement error parameters.

Simulation results show potential for secure quantum communication.

Abstract

Quantum networks are expected to enhance distributed quantum computing and quantum communication over long distances while providing security dependent upon physical effects rather than mathematical assumptions. Through simulation, we show that a quantum network utilizing only entanglement purification or only quantum error correction as error management strategies cannot create Bell pairs with fidelity that exceeds the requirement for a secured quantum key distribution protocol for a broad range of hardware parameters. We propose hybrid strategies utilizing quantum error correction on top of purification and show that they can produce Bell pairs of sufficiently high fidelity. We identify the error parameter regime for gate and measurement errors in which these hybrid strategies are applicable.