Geometrical effects on energy transfer in disordered open quantum systems

Mohseni, Masoud; Shabani, Alireza; Lloyd, Seth; Omar, Yasser; Rabitz, Herschel

doi:10.1063/1.4807084

Cited by 32 publications

(36 citation statements)

References 49 publications

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“…3,4 Previous research has found that maximal transport efficiency will be obtained at a finite dephasing rate when dephasing noise is beneficial to the system and has quantified the optimal dephasing rate as a function of both dissipation and sink coupling strength. 2 The current work extends previous studies 2,4,[18][19][20] by examining the relationship between the coupling strength between chromophores and the optimal dephasing rate. We demonstrate that not only does an optimal dephasing rate exist in both one-and two-dimensional networks but also that it increases in magnitude with increasing coupling strength between chromophores.…”

Section: Introductionsupporting

confidence: 58%

Relations between environmental noise and electronic coupling for optimal exciton transfer in one- and two-dimensional homogeneous and inhomogeneous quantum systems

Forgy

Mazziotti

2014

The Journal of Chemical Physics

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Recent studies have indicated that environmental noise may increase energy-transfer efficiency in quantum systems. For homogeneous networks of chromophores previous studies have primarily considered excitonic transport in one-dimensional (linear) networks. In our study, we expand previous research to a two-dimensional fully coupled topology of chromophore molecules. We demonstrate that not only does an optimal dephasing rate exist in both one- and two-dimensional networks but also that it increases in magnitude with increasing coupling strength between chromophores. Optimal transport occurs when the noise quenches the entanglement between local modes that prevent the exciton from moving efficiently to the target site. We find that these results are insensitive to minor site defects such as those found in realistic systems. We contrast these findings to systems with a high degree of inhomogeneity, in which the optimal dephasing rate is largely set by the system topology and does not vary significantly with respect to coupling strength. Our findings have potential applications to systems such as quantum dot arrays and carbon nanotube structures.

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Section: Introductionsupporting

confidence: 58%

Relations between environmental noise and electronic coupling for optimal exciton transfer in one- and two-dimensional homogeneous and inhomogeneous quantum systems

Forgy

Mazziotti

2014

The Journal of Chemical Physics

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“…As regards the role of decoherence in the mixing time of both discrete-time and continuous-time quantum walks, especially for chains, cycles and hypercubes, a review appears in [21]. Moreover, in the context of light-harvesting phenomena, the role of geometry has also been investigated in terms of structure optimization [53], in the presence of disordered systems [54,55], and to propose design principles for biomimetic structures [56].…”

Section: Introductionmentioning

confidence: 99%

Universally optimal noisy quantum walks on complex networks

Caruso

2014

New J. Phys.

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Transport properties play a crucial role in several fields of science, for example biology, chemistry, sociology, information science and physics. The behavior of many dynamical processes running over complex networks is known to be closely related to the geometry of the underlying topology, but this connection becomes even harder to understand when quantum effects come into play. Here, we exploit the Kossakowski-Lindblad formalism of quantum stochastic walks to investigate the capability of quickly and robustly transmitting energy (or information) between two distant points in very large complex structures, remarkably assisted by external noise and quantum features such as coherence. An optimal mixing of classical and quantum transport is, very surprisingly, quite universal for a large class of complex networks. This widespread behavior turns out to be also extremely robust with respect to geometry changes. These results might pave the way for designing optimal bio-inspired geometries of efficient transport nanostructures that can be used for solar energy and also quantum information and communication technologies.

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“…This phenomenon has generally gone under the name of noise-assisted transport (NAT). In this context, the role of geometry has been theoretically analyzed in terms of structure optimization [16], in the case of disordered systems [17], and also for the proposal of design principles for biomimetic structures [18]. Therefore, the possibility to experimentally reproduce NAT effects in purely optical networks with controllable parameters and topology, would allow one to verify the predictions of NAT models in simple test systems.…”

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confidence: 99%

Observation of Noise-Assisted Transport in an All-Optical Cavity-Based Network

Viciani¹,

Lima²,

Bellini³

et al. 2015

Phys. Rev. Lett.

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Recent theoretical and experimental efforts have shown the remarkable and counter-intuitive role of noise in enhancing the transport efficiency of complex systems. Here, we realize simple, scalable, and controllable optical fiber cavity networks that allow us to analyze the performance of transport networks for different conditions of interference, dephasing and disorder. In particular, we experimentally demonstrate that the transport efficiency reaches a maximum when varying the external dephasing noise, i.e. a bell-like shape behavior that had been predicted only theoretically. These optical platforms are very promising simulators of quantum transport phenomena, and could be used, in particular, to design and test optimal topologies of artificial light-harvesting structures for future solar energy technologies. The transmission of energy through interacting systems plays a crucial role in many fields of physics, chemistry, and biology. In particular, the study and a full understanding of the mechanisms driving the energy transport may open interesting perspectives both to improve the process of transferring quantum or classical information across complex networks, and to explain the high efficiency of the excitation transfer through a network of chromophores in photosynthetic systems. Indeed, recently, several experiments on light-harvesting complexes have suggested a possible correlation between the remarkable transport efficiency of these systems and the presence of long-lived quantum effects, observed also at room temperature [1][2][3][4][5][6].Stimulated by these results, a large theoretical effort has been undertaken to study transport mechanisms through a network of chromophores or, more in general, through a complex network, bringing to evidence the active role of noise in energy transport. In fact, it is usually accepted that the uncontrollable interaction of a transmission network with an external noisy environment negatively affects the transport efficiency by reducing the coherence of the system [7]. However, the noise has also been found to play a positive role in assisting the transport of energy [8][9][10][11][12][13] and information [14], and loss-induced optical transparency has been observed in waveguide systems [15]. In certain circumstances, the presence of noise can lead to the inhibition of destructive interference and to the opening of additional pathways for excitation transfer, with a consequent increase of the transport efficiency [10]. This phenomenon has generally gone under the name of noise-assisted transport (NAT). In this context, the role of geometry has been theoretically analyzed in terms of structure optimization [16], in the case of disordered systems [17], and also for the proposal of design principles for biomimetic structures [18]. Therefore, the possibility to experimentally reproduce NAT effects in purely optical networks with controllable parameters and topology, would allow one to verify the predictions of NAT models in simple test systems. Moreover, the investigation...

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Geometrical effects on energy transfer in disordered open quantum systems

Cited by 32 publications

References 49 publications

Relations between environmental noise and electronic coupling for optimal exciton transfer in one- and two-dimensional homogeneous and inhomogeneous quantum systems

Relations between environmental noise and electronic coupling for optimal exciton transfer in one- and two-dimensional homogeneous and inhomogeneous quantum systems

Universally optimal noisy quantum walks on complex networks

Observation of Noise-Assisted Transport in an All-Optical Cavity-Based Network

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