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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2509.17332 |
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| _version_ | 1866916960102514688 |
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| author | Vieira, V. C. de Paula, F. M. |
| author_facet | Vieira, V. C. de Paula, F. M. |
| contents | We analyze quantum coherence generated by non-interacting magnons in a ferromagnetic spin chain described by the isotropic Heisenberg model. The exact expression derived for the reduced density operator of an arbitrary subsystem reveals that single-site coherence vanishes, while maximal coherence arises in a pure single-mode magnon state. Remarkably, this maximum depends solely on the number of coherently superposed microstates. Based on this property, we introduce coherence-based definitions of entropy, temperature, and heat capacity, establishing a formal analogy with standard thermodynamic quantities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_17332 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum coherence induced by magnons Vieira, V. C. de Paula, F. M. Quantum Physics Statistical Mechanics We analyze quantum coherence generated by non-interacting magnons in a ferromagnetic spin chain described by the isotropic Heisenberg model. The exact expression derived for the reduced density operator of an arbitrary subsystem reveals that single-site coherence vanishes, while maximal coherence arises in a pure single-mode magnon state. Remarkably, this maximum depends solely on the number of coherently superposed microstates. Based on this property, we introduce coherence-based definitions of entropy, temperature, and heat capacity, establishing a formal analogy with standard thermodynamic quantities. |
| title | Quantum coherence induced by magnons |
| topic | Quantum Physics Statistical Mechanics |
| url | https://arxiv.org/abs/2509.17332 |