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Monopoles, Scattering and Generalized Symmetries on a Quantum Computer

  • Oliver O'Brien
  • Atsushi Ueda
  • Etienne Granet
  • Henrik Dreyer
  • Frank Verstraete
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Abstract

Quantum computers have advanced to the stage that interesting many-body quantum phenomena can be observed. A striking example is the magnetic monopole paradox, a problem that was only solved recently using the language of generalized symmetries. Here we demonstrate a quantum spin chain analogue of magnetic monopole scattering on Quantinuum System Model H2. We implement a novel protocol for preparing a localized quasiparticle wavepacket on top of the ground state. By combining this protocol with time evolution across a duality defect, we efficiently convert local particles into non-local string-like excitations. We demonstrate this particle-to-string conversion in the transverse-field Ising model and a symmetry-protected topological (SPT) phase of the cluster model. Our results establish duality defects and generalized symmetries as practical resources for preparing and probing non-local excitations on quantum hardware.

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Cite

BibTeXRIS
BibTeX
@misc{obrien2026monopoles,
  title = {{Monopoles, Scattering and Generalized Symmetries on a Quantum Computer}},
  author = {Oliver O'Brien and Atsushi Ueda and Etienne Granet and Henrik Dreyer and Frank Verstraete},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.07960},
  eprint = {2611.07960},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.07960},
}
RIS
TY  - UNPB
TI  - Monopoles, Scattering and Generalized Symmetries on a Quantum Computer
AU  - Oliver O'Brien
AU  - Atsushi Ueda
AU  - Etienne Granet
AU  - Henrik Dreyer
AU  - Frank Verstraete
PY  - 2026
DA  - 2026/11/05
PB  - arXiv
DO  - 10.48550/arxiv.2611.07960
UR  - https://arxiv.org/abs/2611.07960
AB  - Quantum computers have advanced to the stage that interesting many-body quantum phenomena can be observed. A striking example is the magnetic monopole paradox, a problem that was only solved recently using the language of generalized symmetries. Here we demonstrate a quantum spin chain analogue of magnetic monopole scattering on Quantinuum System Model H2. We implement a novel protocol for preparing a localized quasiparticle wavepacket on top of the ground state. By combining this protocol with time evolution across a duality defect, we efficiently convert local particles into non-local string-like excitations. We demonstrate this particle-to-string conversion in the transverse-field Ising model and a symmetry-protected topological (SPT) phase of the cluster model. Our results establish duality defects and generalized symmetries as practical resources for preparing and probing non-local excitations on quantum hardware.
ER  -