INFLUENCE OF THE COUNTER-ROTATING TERMS ON THE RABI OSCILLATIONS IN THE POLYATOMIC JAYNES-CUMMINGS MODEL WITH CAVITY LOSSES FOR INITIAL FOCK-STATE FIELDS

1996 ◽  
Vol 10 (26) ◽  
pp. 1311-1322
Author(s):  
J. SEKE
Keyword(s):  
Dipole Moment ◽  
Time Evolution ◽  
Population Inversion ◽  
Photon Number ◽  
Numerical Results ◽  
Rabi Oscillations ◽  
Virtual Photons ◽  
Fock State ◽  
The Mean ◽  
Atomic Population Inversion

The significance of the counter-rotating terms in the polyatomic Jaynes-Cummings model with cavity losses is demonstrated. Numerical results for the time evolution of the atomic population inversion and dipole moment for an initial Fock-state field with different photon numbers are presented for various cavity dampings. The appearance of new steady states for the population inversion and the mean-photon number under the influence of the counter-rotating terms is pointed out. Namely, as is shown, the presence of “virtual photons”, produced by the counter-rotating terms, leads to these effects.

INFLUENCE OF THE COUNTER-ROTATING TERMS ON THE RABI OSCILLATIONS AND SQUEEZING IN THE POLYATOMIC JAYNES-CUMMINGS MODEL WITH CAVITY LOSSES FOR INITIAL COHERENT FIELDS

1996 ◽  
Vol 10 (11) ◽  
pp. 487-496
Author(s):  
J. SEKE
Keyword(s):  
Dipole Moment ◽  
Time Evolution ◽  
Population Inversion ◽  
Photon Number ◽  
Steady States ◽  
Numerical Results ◽  
Rabi Oscillations ◽  
Coherent Field ◽  
The Mean ◽  
Atomic Population Inversion

The influence of the counter-rotating terms in the polyatomic Jaynes-Cummings model with cavity losses is investigated. Numerical results for the time evolution of the atomic population inversion, dipole moment, mean-photon number and atomic and field squeezing parameters for an initial coherent field are presented for different cavity dampings. As a consequence of the counter-rotating terms, the appearance of new steady states for the population inversion and the mean-photon number is pointed out.

INFLUENCE OF THE COUNTER-ROTATING TERMS ON THE RABI OSCILLATIONS AND SQUEEZING IN THE JAYNES-CUMMINGS MODEL WITH CAVITY LOSSES FOR INITIAL COHERENT FIELDS

1994 ◽  
Vol 08 (20) ◽  
pp. 1233-1242
Author(s):  
J. SEKE
Keyword(s):  
Dipole Moment ◽  
Time Evolution ◽  
Population Inversion ◽  
Steady States ◽  
Numerical Results ◽  
Rabi Oscillations ◽  
Coherent Field ◽  
Atomic Population Inversion

The significance of the counter-rotating terms in the Jaynes-Cummings model with cavity losses is demonstrated. Numerical results for the time evolution of the atomic population inversion, dipole moment, and atomic and field squeezing parameters for an initial coherent field are presented for different cavity dampings. In low-Q cavities the counter-rotating terms lead to the appearance of new steady states.

INFLUENCE OF THE COUNTER ROTATING TERMS ON THE SQUEEZING IN THE JAYNES–CUMMINGS MODEL FOR COHERENT AND SQUEEZED FIELDS

1994 ◽  
Vol 08 (07) ◽  
pp. 431-438
Author(s):  
J. SEKE
Keyword(s):  
Time Evolution ◽  
Significant Influence ◽  
Population Inversion ◽  
Numerical Results ◽  
Atomic Population Inversion

The significant influence of the counter rotating terms on the squeezing in the Jaynes–Cummings model is demonstrated. Numerical results for the time evolution of the atomic population inversion, and atomic and field squeezing parameters for initially coherent and squeezed fields are presented.

scholarly journals Correlated Relation between Quantum Discord and Entanglement of Two-Atom in Thermal Reservoirs

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Xue-Qun Yan ◽  
Zhuan-Lin Yue
Keyword(s):  
Time Evolution ◽  
Strong Correlation ◽  
Quantum Discord ◽  
Photon Number ◽  
Dynamical Evolution ◽  
Evolution Process ◽  
Qubit System ◽  
The Mean ◽  
Evolution Behavior

We study the time evolution of quantum discord and entanglement of a two-qubit system in thermal reservoirs. We find that there are no simple ordering relations between entanglement and quantum discord for the dynamical evolution behavior; that is, quantum discord may be smaller or larger than entanglement in the evolution process. However, a strong correlation between changes of the ordering relations and the mean photon number is found. In addition, it also shows that entanglement is not the strongest form of nonclassicality.

JAYNES-CUMMINGS MODEL WITH DISPLACED NUMBER STATES

1991 ◽  
Vol 05 (05) ◽  
pp. 797-814 ◽  
Author(s):  
V. BUŽEK ◽  
I. JEX ◽  
M. BRISUDOVÁ
Keyword(s):  
Time Evolution ◽  
Population Inversion ◽  
Emission Spectra ◽  
Cavity Field ◽  
Level Atom ◽  
Number State ◽  
Atomic Population Inversion

We investigate the dynamics of the Jaynes-Cummings model with the cavity field initially prepared in the displaced number state. The time evolution of the atomic population inversion, squeezing of the cavity field and the emission spectra from the two-level atom are studied.

scholarly journals Numerical Modeling of Flow Over a Rectangular Broad-Crested Weir with a Sloped Upstream Face

Water ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1663 ◽  
Author(s):  
Lei Jiang ◽  
Mingjun Diao ◽  
Haomiao Sun ◽  
Yu Ren
Keyword(s):  
Numerical Simulations ◽  
Discharge Coefficient ◽  
Separation Zone ◽  
Turbulence Models ◽  
Numerical Results ◽  
Upstream Face ◽  
Flow Conditions ◽  
Flow Features ◽  
The Mean ◽  
Absolute Percent Error

The objective of this study was to evaluate the effect of the upstream angle on flow over a trapezoidal broad-crested weir based on numerical simulations using the open-source toolbox OpenFOAM. Eight trapezoidal broad-crested weir configurations with different upstream face angles (θ = 10°, 15°, 22.5°, 30°, 45°, 60°, 75°, 90°) were investigated under free-flow conditions. The volume-of-fluid (VOF) method and two turbulence models (the standard k-ε model and the SST k-w model) were employed in the numerical simulations. The numerical results were compared with the experimental results obtained from published papers. The root mean square error (RMSE) and the mean absolute percent error (MAPE) were used to evaluate the accuracy of the numerical results. The statistical results show that RMSE and MAPE values of the standard k-ε model are 0.35–0.67% and 0.50–1.48%, respectively; the RMSE and MAPE values of the SST k-w model are 0.25–0.66% and 0.55–1.41%, respectively. Additionally, the effects of the upstream face angle on the flow features, including the discharge coefficient and the flow separation zone, were also discussed in the present study.

Quantum discord and entanglement of two atoms in a micromaser-type system

2016 ◽  
Vol 30 (15) ◽  
pp. 1650190
Author(s):  
Xue-Qun Yan ◽  
Fu-Zhong Wang
Keyword(s):  
Time Evolution ◽  
Mixed State ◽  
Quantum Discord ◽  
Type System ◽  
Complete Loss ◽  
Entangled State ◽  
Fock State

The correlations dynamics of two atoms in the case of a micromaser-type system is investigated. We show that the entangled state can be created by initially maximally mixed state and there exist collapse and revival phenomena for the time evolutions of both entanglement and quantum discord under the system considered as the field is initially in the Fock state. Our results confirm that entanglement and quantum discord have similar behaviors in certain time ranges, such as their oscillations during the time evolution being almost in phase, but they also present significant differences, such as quantum discord being maintained even after the complete loss of entanglement. Furthermore, we exhibit clearly that the dynamics of quantum discord under the action of environment are intimately related to the generation and evolution of entanglement.

scholarly journals Mean square of the dipole moment of a macromolecule as a function of the ordering of its monomeric units

2021 ◽  
pp. 30-33
Author(s):  
N. N. Matveev ◽  
V. I. Lisitsyn ◽  
V. V. Saushkin ◽  
N. S. Kamalova
Keyword(s):  
Temperature Field ◽  
Dipole Moment ◽  
Mean Square ◽  
Flexible Chain ◽  
External Influences ◽  
Conformational Model ◽  
The Mean

The most important information for the practical use of flexible-chain polymers is the change in structure in the presence of external influences. A conformational model for calculating the mean square of the dipole moment of a macromolecule is constructed in this work, provided that there is no correlation between the conformations of monomer units in a heterogeneous temperature field.

The influence of the classical homogenous gravitational field on interaction of a three-level atom with a single mode cavity field

2015 ◽  
Vol 29 (29) ◽  
pp. 1550175 ◽  
Author(s):  
N. H. Abd El-Wahab ◽  
Ahmed Salah
Keyword(s):  
Electromagnetic Field ◽  
Gravitational Field ◽  
Photon Number ◽  
Single Mode ◽  
Temporal Behavior ◽  
Cavity Field ◽  
Text Type ◽  
Level Atom ◽  
The Mean ◽  
Single Mode Cavity

We study the interaction between a single mode electromagnetic field and a three-level [Formula: see text]-type atom in the presence of a classical homogenous gravitational field when the atom is prepared initially in the momentum eigenstate. The model includes the detuning parameters and the classical homogenous gravitational field. The wave function is calculated by using the Schrödinger equation for a coherent electromagnetic field and an atom is in its excited state. The influence of the detuning parameter and the classical homogenous gravitational field on the temporal behavior of the mean photon number, the normalized second-order correlation function and the normal squeezing is analyzed. The results show that the presence of these parameters has an important effect on these phenomena. The conclusion is reached and some features are given.

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