Work

Counterintuitive Yet Efficient Regimes for Measurement-Based Quantum Computation on Symmetry-Protected Spin Chains

Year: 2024

Type: article

Abstract: Quantum states picked from nontrivial symmetry-protected topological (SPT) phases have computational power in measurement-based quantum computation. This power is uniform across SPT phases, and is unlocked by measurements that break the symmetry. Except at special points in the phase, all computational schemes known to date place these symmetry-breaking measurements far apart, to avoid the correlations introduced by spurious, nonuniversal entanglement. In this work, we investigate the opposite regime of computation where the symmetry-breaking measurements are packed densely. We show that not only does the computation still function, but in fact, under reasonable physical assumptions, this is the most resource efficient mode.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.133.160601

Authors: Arnab Adhikary, Wang Yang, Robert Raussendorf

Institutions: University of British Columbia, Nankai University, Leibniz University Hannover

Language: English

Topic: Quantum many-body systems

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Alexander von Humboldt-Stiftung, Canada First Research Excellence Fund, Natural Sciences and Engineering Research Council of Canada, Army Research Office

Award: G6309441655