Decoherence dynamics in a polaron system with collective dephasing
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916546987687936 |
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| author | Bashir, Saima Lone, Muzaffar Qadir Ganai, Prince A |
| author_facet | Bashir, Saima Lone, Muzaffar Qadir Ganai, Prince A |
| contents | Within quantum information frameworks, managing decoherence stands as a pivotal task. The present work delves into decoherence dynamics of a dressed qubit, represented by a spinless fermion hopping between two lattice sites that are strongly coupled to a collective bosonic bath. To simplify calculations under strong coupling, we adopt the Lang-Firsov transformation, effectively minimizing system-bath interactions. Within the polaron perspective using Ohmic bath spectral density with a Gaussian cutoff, we identify a fundamental timescale $s$ (equivalently a length scale $l$), dictating coherence decay. Utilizing a quantum master equation in the energy eigen basis while maintaining fixed particle number, we demonstrate that coherence persists for small $s$ values but diminishes for larger ones. Additionally, we explore the utilization of $π$-pulses to manipulate decoherence within the system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_00355 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Decoherence dynamics in a polaron system with collective dephasing Bashir, Saima Lone, Muzaffar Qadir Ganai, Prince A Quantum Physics Other Condensed Matter Within quantum information frameworks, managing decoherence stands as a pivotal task. The present work delves into decoherence dynamics of a dressed qubit, represented by a spinless fermion hopping between two lattice sites that are strongly coupled to a collective bosonic bath. To simplify calculations under strong coupling, we adopt the Lang-Firsov transformation, effectively minimizing system-bath interactions. Within the polaron perspective using Ohmic bath spectral density with a Gaussian cutoff, we identify a fundamental timescale $s$ (equivalently a length scale $l$), dictating coherence decay. Utilizing a quantum master equation in the energy eigen basis while maintaining fixed particle number, we demonstrate that coherence persists for small $s$ values but diminishes for larger ones. Additionally, we explore the utilization of $π$-pulses to manipulate decoherence within the system. |
| title | Decoherence dynamics in a polaron system with collective dephasing |
| topic | Quantum Physics Other Condensed Matter |
| url | https://arxiv.org/abs/2501.00355 |