scholarly journals Nonclassical Effects Based on Husimi Distributions in Two Open Cavities Linked by an Optical Waveguide

Entropy ◽  
2020 ◽  
Vol 22 (7) ◽  
pp. 767
Author(s):  
Abdel-Baset A. Mohamed ◽  
Hichem Eleuch
Keyword(s):  
Phase Space ◽  
Quantum Wells ◽  
Optical Waveguide ◽  
Quantum Coherence ◽  
Physical Parameters ◽  
Medium Density ◽  
Wehrl Entropy ◽  
Optical Medium ◽  
Optical Susceptibility ◽  
Open Cavities

Nonclassical effects are investigated in a system formed by two quantum wells, each of which is inside an open cavity. The cavities are spatially separated, linked by a fiber, and filled with a linear optical medium. Based on Husimi distributions (HDs) and Wehrl entropy, we explore the effects of the physical parameters on the generation and the robustness of the mixedness and HD information in the phase space. The generated quantum coherence and the HD information depend crucially on the cavity-exciton and fiber cavity couplings as well as on the optical medium density. The HD information and purity are lost due to the dissipation. This loss may be inhibited by increasing the optical susceptibility as well as the couplings of the exciton-cavity and the fiber-cavity. These parameters control the regularity, amplitudes, and frequencies of the generated mixedness.

scholarly journals Quasi-probability information in a coupled two-qubit system interacting non-linearly with a coherent cavity under intrinsic decoherence

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Abdel-Baset A. Mohamed ◽  
Hichem Eleuch
Keyword(s):  
Phase Space ◽  
Quantum Coherence ◽  
Coupling Constants ◽  
Light Quantum ◽  
Wehrl Entropy ◽  
Intrinsic Decoherence ◽  
Highly Sensitive ◽  
Qubit System ◽  
Probability Information ◽  
Q Function

AbstractWe explore the phase space quantum effects, quantum coherence and non-classicality, for two coupled identical qubits with intrinsic decoherence. The two qubits are in a nonlinear interaction with a quantum field via an intensity-dependent coupling. We investigate the non-classicality via the Wigner functions. We also study the phase space information and the quantum coherence via the Q-function, Wehrl density, and Wehrl entropy. It is found that the robustness of the non-classicality for the superposition of coherent states, is highly sensitive to the coupling constants. The phase space quantum information and the matter-light quantum coherence can be controlled by the two-qubit coupling, initial cavity-field and the intrinsic decoherence.

scholarly journals Nonclassical Atomic System Dynamics Time-dependently Interacts With Finite Entangled Pair Coherent Parametric Converter Cavity Fields

2021 ◽  
Author(s):  
A.B. mohamed ◽  
E. M. Khalil ◽  
M. Y. Abd-Rabbou
Keyword(s):  
Phase Space ◽  
Time Dependent ◽  
Physical Parameters ◽  
Atomic Coherence ◽  
Wehrl Entropy ◽  
Location Parameters ◽  
Parametric Converter ◽  
Dependent Model ◽  
The Difference ◽  
Quantum Phenomena

Abstract We consider a time-dependent model that describes a qubit time-dependently interacts with a cavity containing finite entangled pair coherent parametric converter fields. The dynamics of some quantum phenomena, as: phase space information, quantum entanglement and squeezing, are explored by atomic Husimi function, atomic Wehrl entropy, variance, and entropy squeezing. The influences of the unitary qubit-cavity interaction, the difference between the two-mode photon numbers, the initial atomic coherence, and the time-dependent qubit location are investigated. It is found that the regularity, the amplitudes and the frequency of the quantum phenomena can be controlled by the physical parameters. For the initial atomic pure state, the qubit-cavity entanglement, the qubit phase space information, and atomic squeezing can be generated strongly compared to those of the initial atomic mixed state. The time-dependent location parameters enhance the generated quantum phenomena, and its effect can be enhanced by the parameters of the two-mode photon numbers and the initial atomic coherence.

Bures and trace-distance correlations of quantum wells in open microcavities linked by an optical waveguide

Optik ◽  
2021 ◽  
Vol 225 ◽  
pp. 165744
Author(s):  
A.-B.A. Mohamed ◽  
M. Abdel-Aty ◽  
H. Eleuch
Keyword(s):  
Quantum Wells ◽  
Optical Waveguide ◽  
Trace Distance

scholarly journals Influence of the Coupling between Two Qubits in an Open Coherent Cavity: Nonclassical Information via Quasi-Probability Distributions

Entropy ◽  
2019 ◽  
Vol 21 (12) ◽  
pp. 1137 ◽  
Author(s):  
Abdel-Baset A. Mohamed ◽  
Hichem Eleuch ◽  
Abdel-Shafy F. Obada
Keyword(s):  
Quantum Coherence ◽  
Probability Distributions ◽  
Microwave Cavity ◽  
Wehrl Entropy ◽  
Intrinsic Decoherence ◽  
Probability Functions ◽  
Decoherence Rate ◽  
Two Level Systems ◽  
Q Function ◽  
Nonclassical Information

In this paper, we investigate the dynamics of two coupled two-level systems (or qubits) that are resonantly interacting with a microwave cavity. We examine the effects of the intrinsic decoherence rate and the coupling between the two qubits on the non-classicality of different system partitions via quasi-probability functions. New definitions for the partial Q-function and its Wehrl entropy are used to investigate the information and the quantum coherence of the phase space. The amount of the quantum coherence and non-classicality can be appropriately tuned by suitably adopting the rates of the intrinsic-decoherence and the coupling between the two qubits. The intrinsic decoherence has a pronounced effect on the negativity and the positivity of the Wigner function. The coupling between the two qubits can control the negativity and positivity of the quasi-probability functions.

scholarly journals Phase space structures generated by absorbing obstacles in streaming plasmas

2005 ◽  
Vol 23 (3) ◽  
pp. 853-865 ◽  
Author(s):  
P. Guio ◽  
H. L. Pécseli
Keyword(s):  
Phase Space ◽  
Collisionless Plasma ◽  
Flow Characteristics ◽  
Plasma Potential ◽  
Velocity Shear ◽  
Space Structures ◽  
Space Plasmas ◽  
Physical Parameters ◽  
Particle In Cell ◽  
Cell Simulation

Abstract. The dynamic behavior of a collisionless plasma flowing around an obstacle is investigated by numerical methods. In the present studies, the obstacle is formed by an absorbing cylinder, and a 2-D electrostatic particle-in-cell simulation is used to study the flow characteristics, with extensions to a fully 3-D generalization of the problem demonstrated as well. The formation of irregular filamented density depletions, oblique to the flow, is observed. The structures form behind the obstacle, in a region with a strong velocity shear, but also other instability mechanisms can be identified. The dynamics of these structures is highly dependent on the physical parameters of the plasma, and they can either be quasi-stationary or undergo a dynamic evolution. The structures are found to be associated with phase-space vortices, observed especially in the phase space spanned by the velocity direction perpendicular to the flow and the spatial coordinate in the same direction. The bias of the obstacle with respect to the plasma potential is found to be an important parameter for the dynamics of the structures, but seemingly not for their formation as such. The results can be of interest in the interpretation of structures in space plasmas as observed by instrumented spacecrafts.

Dispersion of nonlinear optical susceptibility of GaAs/AlxGa1−xAs multiple quantum wells in the exciton region

1990 ◽  
Vol 42 (8) ◽  
pp. 5117-5119 ◽  
Author(s):  
Zheng-hao Chen ◽  
Yuan-lin Xie ◽  
Shi-jie Gu ◽  
Yue-liang Zhou ◽  
Da-fu Cui ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Nonlinear Optical ◽  
Multiple Quantum Wells ◽  
Multiple Quantum ◽  
Nonlinear Optical Susceptibility ◽  
Optical Susceptibility ◽  
Exciton Region
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