Universality of quantum computation with cluster states and (X,Y)-plane measurements

TL;DR

This paper demonstrates that measurement-based quantum computing remains universal even without the need for Z measurements, relying solely on cluster states and (X,Y)-plane measurements.

Contribution

It proves that universality in MBQC can be achieved without Z measurements, expanding the understanding of measurement requirements.

Findings

Universality is possible with only (X,Y)-plane measurements.

Cluster states are sufficient for universal MBQC without Z measurements.

Theoretical proof of measurement flexibility in MBQC.

Abstract

Measurement-based quantum computing (MBQC) is a model of quantum computation where quantum information is coherently processed by means of projective measurements on highly entangled states. Following the introduction of MBQC, cluster states have been studied extensively both from the theoretical and experimental point of view. Indeed, the study of MBQC was catalysed by the realisation that cluster states are universal for MBQC with (X,Y)-plane and Z measurements. Here we examine the question of whether the requirement for Z measurements can be dropped while maintaining universality. We answer this question in the affirmative by showing that universality is possible in this scenario.