Optimal entanglement generation for efficient hybrid quantum repeaters

TL;DR

This paper introduces a practical protocol for generating high-fidelity entanglement between quantum memories in hybrid quantum repeaters, optimizing success probability and robustness against detector imperfections.

Contribution

It presents a novel entanglement generation protocol that reaches the theoretical success and fidelity limits, improving efficiency over existing methods.

Findings

Achieves the theoretical limit of success probability and fidelity with ideal detectors.

Remains effective with realistic threshold detectors.

Enables more efficient quantum repeaters through simplified error management.

Abstract

We propose a realistic protocol to generate entanglement between quantum memories at neighboring nodes in hybrid quantum repeaters. Generated entanglement includes only one type of error, which enables efficient entanglement distillation. In contrast to the known protocols with such a property, our protocol with ideal detectors achieves the theoretical limit of the success probability and the fidelity to a Bell state, promising higher efficiencies in the repeaters. We also show that the advantage of our protocol remains even with realistic threshold detectors.