Decoherent histories with(out) objectivity in a (broken) apparatus
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866914410750017536 |
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| author | Ferté, Benoît Farci, Davide Cao, Xiangyu |
| author_facet | Ferté, Benoît Farci, Davide Cao, Xiangyu |
| contents | We characterize monitored quantum dynamics in a solvable model exhibiting a phase transition between a measurement apparatus and a scrambler. We show that approximate decoherent histories emerge in both phases with respect to a coarse-grained extensive observable. However, the apparatus phase, where quantum Darwinism emerges, is distinguished by the non-ergodicity of the histories and their correlation with the measured qubit, which selects an ensemble of preferred pointer states. Our results demonstrate a clear distinction between two notions of classicality, decoherent histories and environment-induced decoherence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_16482 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Decoherent histories with(out) objectivity in a (broken) apparatus Ferté, Benoît Farci, Davide Cao, Xiangyu Quantum Physics Statistical Mechanics We characterize monitored quantum dynamics in a solvable model exhibiting a phase transition between a measurement apparatus and a scrambler. We show that approximate decoherent histories emerge in both phases with respect to a coarse-grained extensive observable. However, the apparatus phase, where quantum Darwinism emerges, is distinguished by the non-ergodicity of the histories and their correlation with the measured qubit, which selects an ensemble of preferred pointer states. Our results demonstrate a clear distinction between two notions of classicality, decoherent histories and environment-induced decoherence. |
| title | Decoherent histories with(out) objectivity in a (broken) apparatus |
| topic | Quantum Physics Statistical Mechanics |
| url | https://arxiv.org/abs/2508.16482 |