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Chaos Solitons & Fractals

Entropic uncertainty relation and entanglement of molecular dipoles in an electric field

Zuo-Yuan Zhang, Yuyan Fang, Jin-Fang Li, Jie‐Ru Hu, Jin‐Ming Liu, Zhaoxi Sun, Xinning Huang

Published Jul 8, 2024• 7 citations
Publisher
DOI
10.1016/j.chaos.2024.115220

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Abstract We explore how thermal fluctuations and noisy decoherence affect non-classical correlations and entropic uncertainty relations in a perylene-bisimide (PBI) dimer system represented by two coupled molecular two-level systems. The composite Hamiltonian includes dipole-dipole interaction between the monomers, and the system’s initial state is considered the thermal Gibbs state, which exhibits entanglement at a finite temperature. Environmental noise is introduced through amplitude damping, phase damping, and phase-flip channels, allowing us to trace the evolution of logarithmic negativity, trace distance discord, and the quantum-memory-assisted entropic uncertainty relation (QMA-EUR). The investigation demonstrates that entanglement decays rapidly with increasing temperature and decoherence strength, whereas trace discord remains resilient over a more comprehensive parameter range. This robustness suggests that PBI dimers can retain useful quantum resources under realistic environmental conditions, highlighting their potential as building blocks for molecular quantum information devices.
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