New features of the stationary and moving atom–atom entanglement

Abdel‐Khalek, S.; Halawani, Saraa Hussein

doi:10.1016/j.ijleo.2016.05.102

Cited by 9 publications

(2 citation statements)

References 28 publications

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“…VNE is the most efficient and basic QE measurement tool when the quantum system is in a pure state, so VNE is used to measure entanglement between the field and the two atoms. The VNE is presented in the form of eigenvalues of the atomic density matrix as [5,53]…”

Section: Entanglement and Quantum Fisher Information (Qfi)mentioning

confidence: 99%

Quantum Fisher Information and Entanglement of Moving Two Two-Level Atoms under the Influence of Environmental Effects

Anwar

Usman

Ramzan

et al. 2019

Physics

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We have investigated numerically the dynamics of quantum Fisher information (QFI) and quantum entanglement (QE) of a two moving two-level atomic systems interacting with a coherent and thermal field in the presence of intrinsic decoherence (ID) and Kerr (non-linear medium) and Stark effects. The state of the entire system interacting with coherent and thermal fields is evaluated numerically under the influence of ID and Kerr (nonlinear) and Stark effects. QFI and von Neumann entropy (VNE) decrease in the presence of ID when the atomic motion is neglected. QFI and QE show an opposite response during its time evolution in the presence of a thermal environment. QFI is found to be more susceptible to ID as compared to QE in the presence of a thermal environment. The decay of QE is further damped at greater time-scales, which confirms the fact that ID heavily influences the system's dynamics in a thermal environment. However, a periodic behavior of entanglement is observed due to atomic motion, which becomes modest under environmental effects. It is found that a non-linear Kerr medium has a prominent effect on the VNE but not on the QFI. Furthermore, it has been observed that QFI and QE decay soon under the influence of the Stark effect in the absence of atomic motion. The periodic response of QFI and VNE is observed for both the non-linear Kerr medium and the Stark effect in the presence of atomic motion. It is observed that the Stark, Kerr, ID, and thermal environment have significant effects during the time evolution of the quantum system. Entanglement's sudden death" (ESD) and entanglement sudden birth" (ESB) are observed as a result of entanglement measure in some fascinating and striking physical phenomena [16][17][18][19][20]. The QE is generated in the un-entangled qubits after a finite evolution time in the case of sudden birth. The coherent field is an electromagnetic field (EM) that is considered to be more classical than its quantum field [21]. Squeezed, coherent (even and odd) states of the EM field do not have minimum uncertainty, and they are non-classical quantum states and have a large number of applications for quantum communications and in the detection of weak signals [22].Recently, properties of the Tavis-Cummings model (TCM) were investigated when the time-dependent interaction with field was observed. Open and closed quantum systems were studied in the case of QE between two atoms (qubits) [23,24]. Moreover, a three-photon process was discussed in the case of the QE of two moving atoms interacting with a single-mode field [25]. In [26], the authors studied the atomic Wehrl entropy (AWE) of a V-type three-level atomic system interacting with a two-mode squeezed vacuum state, and the results showed that atomic motion and mode structure play significant and prominent roles in the evolution of AWE.There is always a possibility that the real physical system naturally interacts with the surrounding environment. Decoherence or dissipation may be generated due to the interaction of the quantum system wi...

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Section: Entanglement and Quantum Fisher Information (Qfi)mentioning

confidence: 99%

Quantum Fisher Information and Entanglement of Moving Two Two-Level Atoms under the Influence of Environmental Effects

Anwar

Usman

Ramzan

et al. 2019

Physics

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“…In addition, the time-dependent interaction between two Λ-type three-level atoms and a single-mode cavity field has been discussed [24] when the damping parameter is taken into account. In recent years, much attention has been focused on the properties of multi-atoms and multi-level atomic systems when time-dependent coupling with the field is considered [23][24][25][26][27][28][29]. More recently, the entanglement and entropy squeezing for moving two two-level atoms interacting with a radiation field have been investigated in [30].…”

Section: Introductionmentioning

confidence: 99%

Quantum Control of a Nonlinear Time-Dependent Interaction of a Damped Three-Level Atom

Korashy

Abdel‐Aty

2023

Axioms

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We investigate some new aspects of the nonlinear interaction between a three-level Ξ-type atom and bimodal field. The photon-assisted atomic phase damping, detuning parameter, Kerr nonlinearity and the time-dependent coupling have been considered. The general solution has been obtained by using the Schrődinger equation when the atom and the field are initially prepared in the excited state and coherent state, respectively. The atomic population inversion and concurrence are discussed. It is shown that the time-dependent coupling parameter and the detuning parameter can be considered as quantum controller parameters of the atomic population inversion and quantum entanglement in the considered model.

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