Topological error correction with a Gaussian cluster state

TL;DR

This paper introduces a topological error correction scheme using an eight-partite Gaussian cluster state, capable of correcting multiple errors in continuous-variable quantum systems, enhancing fault tolerance in quantum computing.

Contribution

It presents a novel topological error correction method with continuous variables based on Gaussian cluster states, capable of recognizing and correcting multi-mode errors.

Findings

Protection against single quadrature phase displacement errors

Ability to recognize and correct some three-mode errors

Error rate reduction with identical mode errors

Abstract

Topological error correction provides an effective method to correct errors in quantum computation. It allows quantum computation to be implemented with higher error threshold and high tolerating loss rates. We present a topological a error correction scheme with continuous variables based on an eight-partite Gaussian cluster state. We show that topological quantum correlation between two modes can be protected against a single quadrature phase displacement error occurring on any mode and some of two errors occurring on two modes. More interestingly, some cases of errors occurring on three modes can also be recognised and corrected, which is different from the topological error correction with discrete variables. We show that the final error rate after correction can be further reduced if the modes are subjected to identical errors occurring on all modes with equal probability. The presented results provide a feasible scheme for topological error correction with continuous variables and it can be experimentally demonstrated with a Gaussian cluster state.