Information Transport in Classical-Quantum Hybrid System
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911110401097728 |
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| author | Rapp, Julian Joshi, Radhika H. van Steensel, Alwin Nazarov, Yuli V. Ansari, Mohammad H. |
| author_facet | Rapp, Julian Joshi, Radhika H. van Steensel, Alwin Nazarov, Yuli V. Ansari, Mohammad H. |
| contents | Many important quantities in quantum information science, such as entropy and entanglement, are non-linear functions of the density matrix and cannot be expressed as operator observables. Standard open-system approaches evolve only a single copy of the density matrix, making it impossible to track the dynamics of such quantities. A formalism proposed by some of the present authors addressed this challenge by evolving multiple virtual replicas, but was limited to the weak-coupling regime. Here, we extend this approach to strong coupling between a quantum system and classical environments. The resulting multi-replica master equation enables direct evaluation of entropy flow and related metrics in strongly hybridized quantum-classical systems. Our results show that quantum coherence and hybridization jointly suppress net entropy transfer, creating a thermodynamic bottleneck. This framework provides a general tool for studying entropy dynamics and guiding the design of more robust, resource-efficient quantum hardware. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_07870 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Information Transport in Classical-Quantum Hybrid System Rapp, Julian Joshi, Radhika H. van Steensel, Alwin Nazarov, Yuli V. Ansari, Mohammad H. Quantum Physics Mesoscale and Nanoscale Physics General Relativity and Quantum Cosmology High Energy Physics - Theory Mathematical Physics Many important quantities in quantum information science, such as entropy and entanglement, are non-linear functions of the density matrix and cannot be expressed as operator observables. Standard open-system approaches evolve only a single copy of the density matrix, making it impossible to track the dynamics of such quantities. A formalism proposed by some of the present authors addressed this challenge by evolving multiple virtual replicas, but was limited to the weak-coupling regime. Here, we extend this approach to strong coupling between a quantum system and classical environments. The resulting multi-replica master equation enables direct evaluation of entropy flow and related metrics in strongly hybridized quantum-classical systems. Our results show that quantum coherence and hybridization jointly suppress net entropy transfer, creating a thermodynamic bottleneck. This framework provides a general tool for studying entropy dynamics and guiding the design of more robust, resource-efficient quantum hardware. |
| title | Information Transport in Classical-Quantum Hybrid System |
| topic | Quantum Physics Mesoscale and Nanoscale Physics General Relativity and Quantum Cosmology High Energy Physics - Theory Mathematical Physics |
| url | https://arxiv.org/abs/2508.07870 |