Hybrid-system approach to fault-tolerant quantum communication

TL;DR

This paper proposes a scalable hybrid-system quantum communication method using topological cluster states, optical multiplexing, and erbium spin nodes to achieve high-rate, long-distance quantum data transfer.

Contribution

It introduces a layered hybrid-system architecture combining topological states and erbium spins for fault-tolerant quantum communication over large distances.

Findings

Achieves 1 kHz end-to-end communication rate.

Supports scalable quantum networks with ~50 qubits per node.

Utilizes erbium spins for deterministic local gates and telecom photon emission.

Abstract

We present a layered hybrid-system approach to quantum communication that involves the distribution of a topological cluster state throughout a quantum network. Photon loss and other errors are suppressed by optical multiplexing and entanglement purification. The scheme is scalable to large distances, achieving an end-to-end rate of 1 kHz with around 50 qubits per node. We suggest a potentially suitable implementation of an individual node composed of erbium spins (single atom or ensemble) coupled via flux qubits to a microwave resonator, allowing for deterministic local gates, stable quantum memories, and emission of photons in the telecom regime.