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October 23, 2025PRX Quantum0 citationsOpen Access

Measurement-Based Quantum Computation in Symmetry-Enriched Topological Phases

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PHPaul HerringerVBVir B. BulchandaniYJYounes Javanmard

Key Points

  • Topological phases enable measurement-based quantum computation through a new analytical framework, expanding computational models.
  • The framework assesses the computational capabilities of phases, overcoming limitations of previous short-range entangled constructions.
  • Ground states of the toric code under anisotropic magnetic fields show a novel application of this theoretical approach.
  • Subsystem symmetries in topological models may enhance computational power, indicating a shift in quantum resource analysis.

Abstract

We present the first examples of topological phases of matter with uniform power for measurement-based quantum computation (MBQC). This is possible due to a new framework for analyzing the computational properties of phases of matter that is more general than previous constructions, which have been limited to short-range entangled phases in one dimension. We show that ground states of the toric code in an anisotropic magnetic field yield a natural, albeit noncomputationally universal, application of our framework. We then present a new model with topological order the ground states of which are universal resources for MBQC. Both topological models are enriched by subsystem symmetries and these symmetries protect their computational power. Our framework greatly expands the range of physical models that can be analyzed from the computational perspective.

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Cite This Study

Herringer et al. (2025) studied this question.

synapsesocial.com/papers/68f9f86eb2c35e10cc4e3b15https://doi.org/10.1103/j2z3-s6d6
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