Entropic uncertainty and quantum correlations in perylene-qubit dimers under decoherence channels

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.