Experimental demonstration of topological error correction

TL;DR

This paper reports the first experimental demonstration of topological error correction using an eight-photon cluster state, showing it can protect quantum information against errors and reduce effective error rates, advancing fault-tolerant quantum computing.

Contribution

It provides the first experimental validation of topological error correction with photonic qubits, demonstrating error protection and reduction in a scalable quantum system.

Findings

Correlation protected against a single qubit error

Effective error rate significantly reduced under simultaneous errors

Viability of topological error correction demonstrated

Abstract

Scalable quantum computing can only be achieved if qubits are manipulated fault-tolerantly. Topological error correction - a novel method which combines topological quantum computing and quantum error correction - possesses the highest known tolerable error rate for a local architecture. This scheme makes use of cluster states with topological properties and requires only nearest-neighbour interactions. Here we report the first experimental demonstration of topological error correction with an eight-photon cluster state. It is shown that a correlation can be protected against a single error on any qubit, and when all qubits are simultaneously subjected to errors with equal probability, the effective error rate can be significantly reduced. This demonstrates the viability of topological error correction. Our work represents the first experimental effort to achieve fault-tolerant quantum information processing by exploring the topological properties of quantum states.