Renormalization of Quantum Operations: Parity-Time Transition and Chaotic Flows
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866909032832303104 |
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| author | Oyaizu, Atsushi Li, Hongchao Nakagawa, Masaya Ueda, Masahito |
| author_facet | Oyaizu, Atsushi Li, Hongchao Nakagawa, Masaya Ueda, Masahito |
| contents | The renormalization group (RG) in statistical physics focuses on ground-state properties of equilibrium systems. However, it is unclear how it should be generalized to nonunitary quantum dynamics caused by dissipation and measurement backaction, in which the notion of conserved energy is absent. Here, we extend the RG to cover nonunitary quantum dynamics governed by quantum operations. By performing coarse-graining in real time, we find that the competition between decoherence and coherent dynamics plays a decisive role in the behavior of the RG flow. In particular, we find that chaotic behavior without fixed points emerges in the RG flow when coherent dynamics is dominant, with the parity-time transition serving as a prototypical example. The measurement-induced parity-time transition belongs to the universality class of the one-dimensional Yang-Lee edge singularity, which serves as a guide for experimentally realizing imaginary fields in lattice spin systems with a quantum system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_10459 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Renormalization of Quantum Operations: Parity-Time Transition and Chaotic Flows Oyaizu, Atsushi Li, Hongchao Nakagawa, Masaya Ueda, Masahito Statistical Mechanics Quantum Physics The renormalization group (RG) in statistical physics focuses on ground-state properties of equilibrium systems. However, it is unclear how it should be generalized to nonunitary quantum dynamics caused by dissipation and measurement backaction, in which the notion of conserved energy is absent. Here, we extend the RG to cover nonunitary quantum dynamics governed by quantum operations. By performing coarse-graining in real time, we find that the competition between decoherence and coherent dynamics plays a decisive role in the behavior of the RG flow. In particular, we find that chaotic behavior without fixed points emerges in the RG flow when coherent dynamics is dominant, with the parity-time transition serving as a prototypical example. The measurement-induced parity-time transition belongs to the universality class of the one-dimensional Yang-Lee edge singularity, which serves as a guide for experimentally realizing imaginary fields in lattice spin systems with a quantum system. |
| title | Renormalization of Quantum Operations: Parity-Time Transition and Chaotic Flows |
| topic | Statistical Mechanics Quantum Physics |
| url | https://arxiv.org/abs/2605.10459 |