Dynamics of nonclassical correlations via local quantum uncertainty for atom and field interacting into a lossy cavity QED

Sales, José S.; Cardoso, Wesley B.; Avelar, A. T.; Almeida, N. G. de

doi:10.1016/j.physa.2015.09.096

Cited by 15 publications

(2 citation statements)

References 31 publications

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“…Recently, it has been proved that LQU meets the criteria for a discord-like quantifier of quantum correlations. The LQU approach has been used as a reliable measure to characterize nonclassical correlations in a few frameworks [39][40][41][42][43][44] The general motivation for studying coherence and quantum correlations in light-harvesting structures is that the precise characterization of these quantum resources is essential, on the one hand, for understanding their functional relation with the energy transfer mechanism and, on ther other, to be able to construct naturally robust quantum devices based on that mechanics. Our principal aim is to demonstrate that the Local Quantum Uncertainty is a highly flexible, robust, and consistent metric to characterize quantum correlations, which is and a novel approach that had not been studied before.…”

Section: Introductionmentioning

confidence: 99%

Local quantum uncertainty as a robust metric to characterize discord-like quantum correlations in subsets of the chromophores in photosynthetic light-harvesting complexes

Chávez-Huerta

Rojas

2020

Rev. Mex. Fís.

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Green sulfur bacteria is a photosynthetic organism whose light-harvesting complex accommodates a pigment-protein complex called Fenna-Matthews-Olson (FMO). The FMO complex sustains quantum coherence and quantum correlations between the electronic states of spatially separated pigment molecules as energy moves with nearly a 100% quantum efficiency to the reaction center. We present a method based on the quantum uncertainty associated to local measurements to quantify discord-like quantum correlations between two subsystems where one is a qubit and the other is a qudit. We implement the method by calculating local quantum uncertainty (LQU), concurrence, and coherence between subsystems of pure and mixed states represented by the eigenstates and by the thermal equilibrium state determined by the FMO Hamiltonian. Three partitions of the seven chromophores network define the subsystems: one chromophore with six chromophores, pairs of chromophores, and one chromophore with two chromophores. Implementation of the LQU approach allows us to characterize quantum correlations that had not been studied before, identify the most quantum correlated subsets of chromophores, and determine that, in the strongest associations of chromophores, the LQU is a monotonically increasing function of the coherence.

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Section: Introductionmentioning

confidence: 99%

Local quantum uncertainty as a robust metric to characterize discord-like quantum correlations in subsets of the chromophores in photosynthetic light-harvesting complexes

Chávez-Huerta

Rojas

2020

Rev. Mex. Fís.

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“…Moreover, investigations of systems in relativistic motion [57][58][59] or subjects to classical, chaotic, thermal, and other kinds of noise environments were also reported [60][61][62][63][64][65][66][67][68][69][70][71]. Studies considering interesting physical systems like quantum dots [72,73], atoms interacting with separated or common cavities [74][75][76] or interacting via plasmonic waveguides [77,78] appeared in the literature. Finally, some interesting physical interpretations, as e.g.…”

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confidence: 99%

The Sudden Change Phenomenon of Quantum Discord

Céleri

Maziero

2017

Quantum Science and Technology

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Even if the parameters determining a system's state are varied smoothly, the behavior of quantum correlations alike to quantum discord, and of its classical counterparts, can be very peculiar, with the appearance of non-analyticities in its rate of change. Here we review this sudden change phenomenon (SCP) discussing some important points related to it: Its uncovering, interpretations, and experimental verifications, its use in the context of the emergence of the pointer basis in a quantum measurement process, its appearance and universality under Markovian and non-Markovian dynamics, its theoretical and experimental investigation in some other physical scenarios, and the related phenomenon of double sudden change of trace distance discord. Several open questions are identified, and we envisage that in answering them we will gain significant further insight about the relation between the SCP and the symmetry-geometric aspects of the quantum state space.

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Local quantum uncertainty and interferometric power for a two-qubit system under decoherence channels with memory

Guo

Yang

Tian

et al. 2019

Quantum Inf Process

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Dynamics of nonclassical correlations via local quantum uncertainty for atom and field interacting into a lossy cavity QED

Cited by 15 publications

References 31 publications

Local quantum uncertainty as a robust metric to characterize discord-like quantum correlations in subsets of the chromophores in photosynthetic light-harvesting complexes

Local quantum uncertainty as a robust metric to characterize discord-like quantum correlations in subsets of the chromophores in photosynthetic light-harvesting complexes

The Sudden Change Phenomenon of Quantum Discord

Local quantum uncertainty and interferometric power for a two-qubit system under decoherence channels with memory

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