# Long-range big quantum-data transmission

## TL;DR

This paper presents a scalable quantum repeater scheme using hashing for entanglement distillation, enabling long-distance quantum communication with high rates and error tolerance, suitable for intercontinental quantum data transmission.

## Contribution

The authors introduce a novel quantum repeater protocol employing hashing, achieving scalable, high-rate, long-distance quantum communication with moderate resources and high error tolerance.

## Key findings

- Achieves arbitrary distance communication with constant resource overhead.
- Supports high loss and operational errors of several percent per qubit.
- Enables practical long-distance quantum data transmission with moderate qubit resources.

## Abstract

We introduce an alternative type of quantum repeater for long-range quantum communication with improved scaling with the distance. We show that by employing hashing, a deterministic entanglement distillation protocol with one-way communication, one obtains a scalable scheme that allows one to reach arbitrary distances, with constant overhead in resources per repeater station, and ultrahigh rates. In practical terms, we show that also with moderate resources of a few hundred qubits at each repeater station, one can reach intercontinental distances. At the same time, a measurement-based implementation allows one to tolerate high loss, but also operational and memory errors of the order of several percent per qubit. This opens the way for long-distance communication of big quantum data.