Different entanglement dynamical behaviors due to initial system-environment correlations

Zhang, Yingjie; Zou, Xu‐Bo; Xia, Yun‐Jie; Guo, Guang‐Can

doi:10.1103/physreva.82.022108

Cited by 50 publications

(28 citation statements)

References 35 publications

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“…The phenomenon, caused by the injection of noise into the system and arising from its inevitable interaction with the surrounding environment, is responsible for the loss of quantum coherence initially present in the system. Recently it was noted that the dynamical behaviors of QD in the presence of the Markovian [7,8] decoherence decay exponentially in time and vanish only asymptotically [9,10], contrary to the entanglement dynamics where sudden death may occur [11][12][13][14][15][16][17][18]. In these above studies, the quantumness of correlation is more robust to the action of the environment than the entanglement itself.…”

Section: Introductionmentioning

confidence: 99%

Decay of quantum correlation under different non-Markovian environmental models

et al. 2012

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We investigate the roles of different environmental models on quantum correlation dynamics of two-qubit composite system interacting with two independent environments. The most common environmental models (the single-Lorentzian model, the squared-Lorentzian model, the two-Lorentzian model and band-gap model) are analyzed. First, we note that for the weak coupling regime, the monotonous decay speed of the quantum correlation is mainly determined by the spectral density functions of these different environments. Then, by considering the strong coupling regime we find that, contrary to what is stated in the weak coupling regime, the dynamics of quantum correlation depends on the non-Markovianity of the environmental models, and is independent of the environmental spectrum density functions.

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Section: Introductionmentioning

confidence: 99%

Decay of quantum correlation under different non-Markovian environmental models

et al. 2012

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“…It has also been demonstrated that the initial correlations have nontrivial differences in quantum tomography process [30]. Besides, it has been found that the initial system-reservoir correlations have significant effects on the entanglement in a two-qubit system [31,32].…”

Section: Introductionmentioning

confidence: 99%

“…Realistically, it is possible and often unavoidable in experiments that the system and its environment are correlated closely at the beginning, especially for the cases of the system strongly coupled to the reservoir [20]. Various initial-correlation-induced effects have been investigated in * wzhang@mail.ncku.edu.tw different open quantum systems [21][22][23][24][25][26][27][28][29][30][31][32]. For example, it has been recently shown that the initial correlations between a qubit and its environment can lead to the distance growth of two quantum states over its initial value [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Non-Markovian dynamics of an open quantum system with initial system-reservoir correlations: A nanocavity coupled to a coupled-resonator optical waveguide

Tan

Zhang

2011

Phys. Rev. A

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In this paper, the exact non-Markovian dynamics of open quantum systems in the presence of initial system-reservoir correlations is investigated for a photonic cavity system coupled to a general non-Markovian reservoir. The exact time-convolutionless master equation incorporating with initial system-reservoir correlations is obtained. The non-Markovian dynamics of the reservoir and the effects of the initial correlations are embedded into the time-dependent coefficients in the master equation. We show that the effects induced by the initial correlations play an important role in the non-Markovian dynamics of the cavity but they are washed out in the steady-state limit in the Markovian regime. Moreover, the initial two-photon correlation between the cavity and the reservoir can induce nontrivial squeezing dynamics to the cavity field.

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“…Most of the studies performed to date have considered single-body systems -a single spin or a single harmonic oscillator coupled to a thermal bath. There are, however, notable exceptions [7,27,34]. In particular, it has been found that if the systems consists of many two-levels systems (TLSs) coupled to a common environment, then the effect of the initial system-environment correlations can be enhanced depending on the number of particles in the system, even though each TLS may be weakly coupled to the environment [34].…”

Section: Introductionmentioning

confidence: 99%

Role of initial system-environment correlations: A master equation approach

Chaudhry

Gong

2013

Phys. Rev. A

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In order to achieve practical implementations of emerging quantum technologies, it is important to have a firm understanding of the dynamics of realistic quantum open systems. Master equations provide a widely used tool in this regard. In this work, we first construct a master equation, valid for weak system-environment coupling, which explicitly takes into account the impact of preparing an initial system state from an equilibrium system-environment state that has system-environment correlations. We then investigate the role of initial system-environment correlations using this master equation for a system consisting of many two-level atoms interacting with a common environment. We show that, in general, due to the initial system-environment correlations before a state preparation, the quantum state of the system can evolve at a faster time-scale. Moreover, we also consider different initial state preparations, and demonstrate that the influence of state preparations depends on the initial states prepared. Our results can be of interest to many topics based on quantum open systems where system-environment correlation effects have been neglected before.

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Different entanglement dynamical behaviors due to initial system-environment correlations

Cited by 50 publications

References 35 publications

Decay of quantum correlation under different non-Markovian environmental models

Decay of quantum correlation under different non-Markovian environmental models

Non-Markovian dynamics of an open quantum system with initial system-reservoir correlations: A nanocavity coupled to a coupled-resonator optical waveguide

Role of initial system-environment correlations: A master equation approach

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