Experimental demonstration of topological error correction

Abstract

Scalable quantum computing can be achieved only if quantum bits are manipulated in a fault-tolerant fashion. Topological error correction--a method that combines topological quantum computation with quantum error correction--has the highest known tolerable error rate for a local architecture. The technique makes use of cluster states with topological properties and requires only nearest-neighbour interactions. Here we report the experimental demonstration of topological error correction with an eight-photon cluster state. We show that a correlation can be protected against a single error on any quantum bit. Also, when all quantum bits are simultaneously subjected to errors with equal probability, the effective error rate can be significantly reduced. Our work demonstrates the viability of topological error correction for fault-tolerant quantum information processing.

On-chip quantum interference between silicon photon-pair sources

“…Bulk crystal spontaneous pair sources have been used successfully in the largest optical quantum information experiments to date -the production [30] and manipulation [31] of 8-photon entanglement. However, spontaneous sources can, in principle, be scaled beyond the limits of these post-selected arrangements by using active multiplexing and feed-forward techniques.…”

Surface Code Threshold in the Presence of Correlated Errors

“…The surface code is considered one of the best quantum error correction codes (QEC) to implement on physical devices [1][2][3]. This steams from two major points: first, all syndromes and operations can be performed with spatially local operators; second, all threshold estimates show that, for sufficiently large lattices, the error threshold is the highest known for two-dimensional architectures with only nearest-neighbor interactions [4][5][6].…”

Block synchronization for quantum information

“…The field has since made various kinds of remarkable progress, from developing quantum analogues of important concepts in classical information theory to finding surprising phenomena that are uniquely quantum information theoretic [2]. Quantum error correction has been realized in various experiments as well [3][4][5][6][7][8][9][10][11].…”