Robustness of quantum correlation for accelerating two atoms coupled with electromagnetic field

2019 ◽  
Vol 34 (09) ◽  
pp. 1950065
Author(s):  
Zhiming Huang ◽  
Haozhen Situ
Keyword(s):  
Electromagnetic Field ◽  
Quantum Information ◽  
Quantum Correlation ◽  
Quantum Information Processing ◽  
Trace Norm ◽  
Entanglement Dynamics ◽  
Vacuum Fluctuation ◽  
Interatomic Separation ◽  
Pauli Matrix ◽  
Initial States

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.

On measures of quantum entanglement — A brief review

2016 ◽  
Vol 14 (06) ◽  
pp. 1640024 ◽  
Author(s):  
Debasis Sarkar
Keyword(s):  
Quantum Mechanics ◽  
Information Processing ◽  
Quantum Information ◽  
Quantum Entanglement ◽  
Quantum Correlation ◽  
Composite System ◽  
Quantum Information Processing ◽  
Bipartite Entanglement

Entanglement is one of the most useful resources in quantum information processing. It is effectively the quantum correlation between different subsystems of a composite system. Mathematically, one of the most hard tasks in quantum mechanics is to quantify entanglement. However, progress in this field is remarkable but not complete yet. There are many things to do with quantification of entanglement. In this review, we will discuss some of the important measures of bipartite entanglement.

Non-Markovian dynamics of correlations: The composite effect of two channels and robust quantum correlation preserving by detuning

2014 ◽  
Vol 29 (02) ◽  
pp. 1450249
Author(s):  
Y. H. Ji ◽  
X. D. Wan
Keyword(s):  
Quantum Information ◽  
Quantum Correlation ◽  
Quantum Discord ◽  
Quantum Information Processing ◽  
Center Frequency ◽  
Cavity Model ◽  
Classical Correlation ◽  
Composite Effect ◽  
Markovian Dynamics ◽  
Dynamics Of Correlations

We investigate the influence of the composite effect and information backflow effect in non-Markovian channel on the dynamics of quantum correlation including quantum entanglement and quantum discord. It is found that, the composite effect of independent channels is not only harmful to the maintenance of quantum correlation but also unfavorable for the maintenance of classic correlation. In a non-Markovian channel, by regulating the discord between qubit and the center frequency of cavity model, the time of quantum correlation and classical correlation of the system can be effectively prolonged. Thus, the quantum information processing can be achieved more easily under larger detuning.

Quantum contextuality of YO-13 rays

2021 ◽  
Vol 36 (12) ◽  
pp. 2150088
Author(s):  
Jie Zhou ◽  
Hui-Xian Meng ◽  
Wei-Min Shang ◽  
Jing-Ling Chen
Keyword(s):  
Quantum Computing ◽  
Information Processing ◽  
Quantum Information ◽  
Quantum Correlation ◽  
Quantum Physics ◽  
Quantum Information Processing ◽  
Experimental Tests ◽  
Dimensional System ◽  
Quantum Contextuality ◽  
Fundamental Quantum Physics

Quantum contextuality, a more general quantum correlation, is an important resource for quantum computing and quantum information processing. Meanwhile, quantum contextuality plays an important role in fundamental quantum physics. Yu and Oh (YO) proposed a proof of the Kochen–Specker theorem for a qutrit with only 13 rays. Here, we further study quantum contextuality of YO-13 rays using the inequality approach. The maximum quantum violation value of the optimal noncontextuality inequality constructed by YO-13 rays is increased to 11.9776 in the four-dimensional system, which is larger than 11.6667 in the qutrit system. The result shows that the set of YO-13 rays has stronger quantum contextuality in the four-dimensional system. Moreover, we provide an all-versus-nothing proof (i.e. Hardy-like proof) to study YO-13 rays without using any inequality, which is easily applied to experimental tests. Our results will further deepen the understanding of YO-13 rays.

Measurement-induced nonlocality in the two-qubit Heisenberg XY model

2015 ◽  
Vol 29 (15) ◽  
pp. 1550098 ◽  
Author(s):  
Wen-Xue Chen ◽  
Yu-Xia Xie ◽  
Xiao-Qiang Xi
Keyword(s):  
Magnetic Field ◽  
Information Processing ◽  
Quantum Information ◽  
External Magnetic Field ◽  
Potential Application ◽  
Quantum Correlation ◽  
Quantum Information Processing ◽  
Quantum Correlations ◽  
Xy Model ◽  
Anisotropic Parameter

Quantum correlations are essential for quantum information processing (QIP). Measurement-induced nonlocality (MIN) is a good measure of quantum correlation, and is favored for its conceptual implication and potential application. We investigated here the particular behaviors of the geometric and entropic measures of MIN in the two-qubit Heisenberg XY model and revealed the effects of anisotropic parameter γ and the external magnetic field B on them. Our results showed that both γ and B can serve as efficient controlling parameters for tuning MIN in the XY model.

scholarly journals Experimentally Demonstrate the Spin-1 Information Entropic Inequality Based on Simulated Photonic Qutrit States

Entropy ◽  
2020 ◽  
Vol 22 (2) ◽  
pp. 219
Author(s):  
Lianzhen Cao ◽  
Xia Liu ◽  
Yang Yang ◽  
Qinwei Zhang ◽  
Jiaqiang Zhao ◽  
...  
Keyword(s):  
Quantum Information ◽  
Quantum Correlation ◽  
Quantum Information Processing ◽  
Quantum Correlations ◽  
Quantum Systems ◽  
Enhancement Effect ◽  
Nonlinear Optical Effect ◽  
Higher Dimensional ◽  
Entropic Inequality ◽  
First Time

Quantum correlations of higher-dimensional systems are an important content of quantum information theory and quantum information application. The quantification of quantum correlation of high-dimensional quantum systems is crucial, but difficult. In this paper, using the second-order nonlinear optical effect and multiphoton interference enhancement effect, we experimentally implement the photonic qutrit states and demonstrate the spin-1 information entropic inequality for the first time to quantitative quantum correlation. Our work shows that information entropy is an important way to quantify quantum correlation and quantum information processing.

Quantum Information Processing

2001 ◽  
Author(s):  
David P. DiVincenzo ◽  
Charles H. Bennett
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Information Processing
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