Yazar "Rossi, Matteo A. C." seçeneğine göre listele

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    Efficient quantum transport in a multi-site system combining classical noise and quantum baths
    (Iop Publishing Ltd, 2020) Kurt, Arzu; Rossi, Matteo A. C.; Piilo, Jyrki
    We study the population dynamics and quantum transport efficiency of a multi-site dissipative system driven by a random telegraph noise (RTN) by using a variational polaron master equation for both linear chain and ring configurations. By using two different environment descriptions-RTN only and a thermal bath+RTN-we show that the presence of the classical noise has a non-trivial role on quantum transport. We observe that there exist large areas of parameter space where the combined bath+RTN influence is clearly beneficial for populating the target state of the transport, and for average trapping time and transport efficiency when accounting for the presence of the reaction center via the use of the sink. This result holds for both of the considered intra-site coupling configurations including a chain and ring. In general, our formalism and achieved results provide a platform for engineering and characterizing efficient quantum transport in multi-site systems both for realistic environments and engineered systems.
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    Quantum transport efficiency in noisy random-removal and small-world networks
    (IOP Publishing Ltd, 2023) Kurt, Arzu; Rossi, Matteo A. C.; Piilo, Jyrki
    We report the results of an in-depth study of the role of graph topology on quantum transport efficiency in random removal and Watts-Strogatz networks. By using four different environmental models-noiseless, driven by classical random telegraph noise (RTN), thermal quantum bath, and bath + RTN-we compare the role of the environment and of the change in network topology in determining the quantum transport efficiency. We find that small and specific changes in network topology is more effective in causing large change in efficiency compared to that achievable by environmental manipulations for both network classes. Furthermore, we have found that noise dependence of transport efficiency in Watts-Strogatz networks can be categorized into six classes. In general, our results highlight the interplay that network topology and environment models play in quantum transport, and pave the way for transport studies for networks of increasing size and complexity-when going beyond so far often used few-site transport systems.