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Chinese Physics Letters

Quantum Correlation without Entanglement in a Two-Atom-Vacuum Field System

曾可, 方卯发

Published Jan 1, 2014• 0 citations
OpenAlex

Abstract

没有在一个 two-atom-vacuum 地系统的纠纷的量关联被调查。量关联上的原子偶极子偶极子相互作用的影响也被检验。当他们的纠纷完全消失在整个进化时，我们发现当两个原子开始处于可分离的激动的状态时，二个原子的量不一致出现。我们详细解释我们的结果。我们的结果提供没有纠纷，在真实系统完成一个量关联资源的一个新奇方法。

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没有在一个 two-atom-vacuum 地系统的纠纷的量关联被调查。量关联上的原子偶极子偶极子相互作用的影响也被检验。当他们的纠纷完全消失在整个进化时，我们发现当两个原子开始处于可分离的激动的状态时，二个原子的量不一致出现。我们详细解释我们的结果。我们的结果提供没有纠纷，在真实系统完成一个量关联资源的一个新奇方法。
Quantum correlation without entanglement in a two-atom-vacuum field system is investigated. The influence of the atomic dipole-dipole interaction on quantum correlation is also examined. We find that, when both atoms are initially in separable excited states, the quantum discord of two atoms appears while their entanglement wholly vanishes throughout the evolution. We explain our results in detail. Our results provide a novel method of achieving a quantum correlation resource without entanglement in the real system.
In this paper, we investigate the behaviors of quantum correlation quantified by trace norm measurement-induced nonlocality (TMIN) for two uniformly accelerated atoms coupled with electromagnetic vacuum fluctuation in the Minkowski vacuum. We firstly discuss the solving process of master equation that governs the system evolution based on the Pauli matrix presentation for two-qubit state. Similar to [Y. Q. Yang et al., Phys. Rev. A 94, 032337 (2016)], we analyze the degradation, creation, revival and enhancement of quantum correlation for different initial states and polarizations of two atoms, and the influence of interatomic separation and acceleration on quantum correlation. Compared with the entanglement dynamics discussed in [Y. Q. Yang et al., Phys. Rev. A 94, 032337 (2016)], it is found that quantum correlation exhibits better robustness than entanglement. This may be helpful for quantum information processing.
A system of two two-level atoms interacting with a squeezed vacuum field can exhibit stationary entanglement associated with nonclassical two-photon correlations characteristic of the squeezed vacuum field. The amount of entanglement present in the system is quantified by the well known measure of entanglement called concurrence. We find analytical formulas describing the concurrence for two identical and nonidentical atoms and show that it is possible to obtain a large degree of steady-state entanglement in the system. Necessary conditions for the entanglement are nonclassical two-photon correlations and nonzero collective decay. It is shown that nonidentical atoms are a better source of stationary entanglement than identical atoms. We discuss the optimal physical conditions for creating entanglement in the system, in particular, it is shown that there is an optimal and rather small value of the mean photon number required for creating entanglement.