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bell-nonlocality Dynamics of Three Remote Atoms in Tavis–Cummings and Jaynes–Cummings Models

Communications in Theoretical Physics 2014年第12期61卷 795-800页

作者：甄秀兰杨青杨名曹卓良 Key Laboratory of Opto-electronic Information Acquisition and Manipulation Ministry of Education School of Physics and Material Science Anhui University School of Electronic and Information Engineering Hefei Normal University

We study the bell-nonlocality dynamics of three remote atoms, two of which are trapped in one single-mode cavity and the third atom is trapped in another remote single-mode cavity. The interactions between the atoms and the cavity modes are studied via Tavis Cummings and Jaynes Cummings models. Here, the two single-mode cavities are introduced to simulate two different enviroments of the three atoms. The tripartite nonlocal correlations are studied in terms of the Svetlichny inequality and the WWZB inequality, respectively. The results show that the tripartite bellnonlocality sudden death will occur for the W state and GHZ state initial conditions. The detailed results demonstrate that the tripartite nonlocality of GHZ state is more robust than that of W state when suffering from the effect of environments.

关键词： bell-nonlocality sudden death W state GHZ state Svetlichny inequality WWZB inequality

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Visualizing and witnessing first-order coherence,bell nonlocality and purity by using a quantum steering ellipsoid in the non-inertial frame

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中国物理B:英文版 2023年第10期32卷 210-218页

作者：杨欢邢玲玲杜明明孔敏张刚叶柳 School of Electrical and Photoelectronic Engineering West Anhui UniversityLu'an 237012China College of Electronic and Optical Engineering Nanjing University of Posts and TelecommunicationsNanjing 210003China School of Physics and Optoelectronic Engineering Anhui UniversityHefei 230039China

A quantum steering ellipsoid(QSE)is a visual characterization for bipartite qubit systems,and it is also a novel avenue for describing and detecting quantum ***,by using a QSE,we visualize and witness the first-order coherence(FOC),bell nonlocality(BN)and purity under non-inertial ***,the collective influences of the depolarizing channel and the non-coherence-generating channel(NCGC)on the FOC,BN and purity are investigated in the QSE *** results reveal that the distance from the center of the QSE to the center of the Bloch sphere visualizes the FOC of a bipartite system,the lengths of the QSE semiaxis visualize the BN,and the QSE's shape and position dominate the purity of the *** can capture the FOC,BN and purity via the shape and position of the QSE in the non-inertial *** depolarizing channel(the NCGC)gives rise to the shrinking and degradation(the periodical oscillation)of the *** can use these traits to visually characterize and detect the FOC,BN and purity under the influence of external *** particular note is that the condition for the QSE to achieve the center of the Bloch sphere cannot be influenced by the depolarizing channel and the *** characterization shows that the conditions for the disappearance of the FOC are invariant under the additional influences of the depolarizing channel and NCGC.

关键词： quantum steering ellipsoid first-order coherence bell-nonlocality purity

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Quantum Measurement of Two-Qubit System in Damping Noise Environment

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Communications in Theoretical Physics 2016年第3期65卷 285-291页

作者：杨青刘慧甄秀兰杨名曹卓良 Key Laboratory of Opto-electronic Information Acquisition and Manipulation Ministry of EducationSchool of Physics& Material ScienceAnhui University School of Electronic and Information Engineering Hefei Normal University

It is known that the inevitable interaction of the entangled qubits with their environments may result in the degradation of quantum *** study the decoherence of two remote qubits under general local single-and two-sided amplitude-damping channel(ADC).By using concurrence,quantum discord and Clauser-Horne-ShimonyHolt(CHSH)inequality,we find that the relation between the residual quantum correlations and the initial ones are ***,Wang et al.[***.54(2015)5]showed that there exist a set of partially entangled states that are more robust than maximally entangled states in terms of the residual quantum correlation measured by concurrence,fully entangled fraction and quantum discord,*** we find that both in single-and two-sided ADC,only the evolution of CHSH inequality with the initial parameter is proportional to that of the initial *** means the initial state with maximally nonlocality will retain its role in the *** implies that the evolution of nonlocality may reveal the characteristics of quantum state ***,we discuss the evolutions of the three different quantum measurements with the initial parameter under generalized amplitude damping channel(GADC)and find that they are all proportional to that of the initial state.

关键词： amplitude noise entanglement concurrence quantum discord bell-nonlocality

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