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The role of the multiple excitation manifold in a driven quantum simulator of an antenna complex

Abstract : Biomolecular light-harvesting antennas operate as nanoscale devices in a regime where the coherent interactions of individual light, matter and vibrational quanta are non-perturbatively strong. The complex behaviour arising from this could, if fully understood, be exploited for myriad energy applications. However, non-perturbative dynamics are computationally challenging to simulate, and experiments on biomaterials explore very limited regions of the non-perturbative parameter space. So-called 'quantum simulators' of light-harvesting models could provide a solution to this problem, and here we employ the hierarchical equations of motion technique to investigate recent supercon-ducting experiments of Potočnik et al. (Nat. Com. 9, 904 (2018)) used to explore excitonic energy capture. By explicitly including the role of optical driving fields, non-perturbative dephasing noise and the full multi-excitation Hilbert space of a three-qubit quantum circuit, we predict the measure-able impact of these factors on transfer efficiency. By analysis of the eigenspectrum of the network, we uncover a structure of energy levels that allows the network to exploit optical 'dark' states and excited state absorption for energy transfer. We also confirm that time-resolvable coherent oscillations could be experimentally observed, even under strong, non-additive action of the driving and optical fields.
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Submitted on : Wednesday, September 23, 2020 - 12:02:15 PM
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A. W. Chin, B. Le Dé, E. Mangaud, O. Atabek, M. Desouter-Lecomte. The role of the multiple excitation manifold in a driven quantum simulator of an antenna complex. Physical Review A, American Physical Society 2020, 102 (2), ⟨10.1103/PhysRevA.102.023708⟩. ⟨hal-02946633⟩

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