Geometric quantum discord and non-Markovianity of structured reservoirs

Hu, Ming‐Liang; Lian, Han‐li

doi:10.1016/j.aop.2015.09.013

Cited by 33 publications

(23 citation statements)

References 45 publications

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“…have found that the revivals of entanglement after a finite time period of complete disappearance can be expected when the system is coupled with a common non-Markovian environment. Up to now, a few interpretations of these revivals have been offered: one of the interpretations is that quantum memory of the environment can inherently influence on the coherence of quantum system 26 27 ; another is that the environment is considered as a control device, and the interactions between quantum system and non-Markovian environment can create quantum correlation 28 29 30 31 32 33 . Here, we will focus on pursuing the intrinsic mechanisms concerning the revivals of entanglement.…”

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confidence: 99%

Entanglement revive and information flow within the decoherent environment

Shi

Wang

Liu

2016

Sci Rep

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In this paper, the dynamics of entanglement is investigated in the presence of a noisy environment. We reveal its revival behavior and probe the mechanisms of this behavior via an information-theoretic approach. By analyzing the correlation distribution and the information flow within the composite system including the qubit subsystem and a noisy environment, it has been found that the subsystem-environment coupling can induce the quasi-periodic entanglement revival. Furthermore, the dynamical relationship among tripartite correlations, bipartite entanglement and local state information is explored, which provides a new insight into the non-Markovian mechanisms during the evolution.

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confidence: 99%

Entanglement revive and information flow within the decoherent environment

Shi

Wang

Liu

2016

Sci Rep

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“…To avoid this difficulty, Dakic et al [6,7] introduced the concept of geometric quantum discord (GQD), which greatly simplifies the calculation process and gives us a better way to understand and study QD. However, GQD is analyzed in a lot of theoretical models, such as a non-interacting simplest type of qubits [8,9], these researches shown GQD can be controlled by the bath and initial state. Among many physical systems in which quantum correlation states can be prepared via various methods, the charge qubit encoded by the electron occupied states in a double quantum dot system has attracted much attention due to its controllability and some unique characteristics in the fields of quantum information and quantum control [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Non-Markovian Dynamics of Geometric Quantum Discord in a Double Quantum Dot System

Ablimit

Hitjan

2021

J Low Temp Phys

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In this paper, we study the geometric quantum discord dynamics of the double quantum dot charge qubit in the non-Markovian environment. We apply the non-perturbative non-Markovian quantum state diffusion method to obtain the exact master equation of the double quantum dot system coupled to two independent non-zero temperature electronic baths. Then, we use this master equation to investigate the effects of non-Markovianity, inter-dot coupling strength and bath temperature on the dynamics of geometric quantum discord. Our studies show that the geometric quantum discord of a double quantum dot system can be modified and enhanced in some cases via these factors.

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“…Recently, geometric quantum discord has become a hot topic in the international academic community, many theoretical and experimental work related to it have emerged [33][34][35][36][37][38][39][40][41]. Due to the ubiquitous environment, any quantum system is difficult to exist in isolation, it is of practical significance to analyze the quantum discord behavior in open systems.…”

Section: Introductionmentioning

confidence: 99%

Geometric quantum discords under Hierarchical-environment with filtering operator

Bai

Zhang

2021

Quantum Inf Process

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We study the dynamic creation of two different geometric quantum discords (GQDs) defined, respectively, via the Hilbert-Schmidt norm (GQD-2) and trace norm (GQD-1) between the two qubits, which are prepared initially in a zero discord two-qubit X -shape state, and subject to a two layers environment that consists of a lossy cavity coupled to the W -coupled lossy cavities. We find that the GQD-2 and GQD-1 exhibit oscillatory behavior in the regime of the strong coupling between the qubit and firstlayer cavity environment. And in both the weak and strong coupling regimes, for the greater the number of cavities in the second-layer environment, the GQDs reach their peak value in a larger time and go to zero more slowly. But in the qubit-cavity coupling, the coupling between two nearest neighbor cavities and the decay rate of cavities in the second-layer environment have the opposite effect on the GQDs. Furthermore, the maximum value of GQDs remains unchanged and the steady value increases, or they both decrease, depending on the threshold value of coupling between the two layers environment. Finally, we propose an effective strategy to improve the GQD-2 and GQD-1 by using local filtering operation.

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Geometric quantum discord and non-Markovianity of structured reservoirs

Cited by 33 publications

References 45 publications

Entanglement revive and information flow within the decoherent environment

Entanglement revive and information flow within the decoherent environment

Non-Markovian Dynamics of Geometric Quantum Discord in a Double Quantum Dot System

Geometric quantum discords under Hierarchical-environment with filtering operator

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