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Non-Clifford gates between stabilizer codes via non-Abelian topological order

Quantum Physics 2025-05-27 v1 Strongly Correlated Electrons

Abstract

We propose protocols to implement non-Clifford logical gates between stabilizer codes by entangling into a non-Abelian topological order as an intermediate step. Generalizing previous approaches, we provide a framework that generates a large class of non-Clifford and non-diagonal logical gates between qudit surface codes by gauging the topological symmetry of symmetry-enriched topological orders. As our main example, we concretely detail a protocol that utilizes the quantum double of S3S_3 to generate a controlled-charge conjugation (CCC\mathcal{C}) gate between a qubit and qutrit surface code. Both the preparation of non-Abelian states and logical state injection between the Abelian and non-Abelian codes are executed via finite-depth quantum circuits with measurement and feedforward. We discuss aspects of the fault-tolerance of our protocol, presenting insights on how to construct a heralded decoder for the quantum double of S3.S_3. We also outline how analogous protocols can be used to obtain logical gates between qudit surface codes by entangling into D(G),\mathcal{D}(G), where GG is a semidirect product of Abelian groups. This work serves as a step towards classifying the computational power of non-Abelian quantum phases beyond the paradigm of anyon braiding on near-term quantum devices.

Keywords

Cite

@article{arxiv.2505.18265,
  title  = {Non-Clifford gates between stabilizer codes via non-Abelian topological order},
  author = {Rohith Sajith and Zijian Song and Brenden Roberts and Varun Menon and Yabo Li},
  journal= {arXiv preprint arXiv:2505.18265},
  year   = {2025}
}

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15 + 9 pages