Intracavity laser pumping of matter and phase transitions in the system of electromagnetic field and optically dense resonant medium without population inversion

2007 ◽  
Author(s):  
V. A. Averchenko ◽  
A. P. Alodjants ◽  
S. M. Arakelyan ◽  
S. N. Bagayev ◽  
E. A. Vinogradov ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Phase Transitions ◽  
Population Inversion ◽  
Resonant Medium ◽  
Laser Pumping ◽  
Intracavity Laser ◽  
Dense Resonant Medium

Dynamics of entanglement and population inversion of two qubits in a hybrid nonlinear system

2021 ◽  
pp. 2150037
Author(s):  
E. M. Khalil ◽  
A.-B. A. Mohamed
Keyword(s):  
Electromagnetic Field ◽  
Nonlinear System ◽  
Analytical Solution ◽  
Nonlinear Interaction ◽  
Population Inversion ◽  
Stark Shift ◽  
Parametric Amplifier ◽  
Kerr Medium ◽  
Interaction Terms

An analytical solution is obtained when the Kerr medium and Stark shift are considered as nonlinear interaction terms to the system containing two-qubit and two-mode electromagnetic field from the parametric amplifier. Dynamics of the population inversion, cavity–qubit and qubit–qubit entanglements are analyzed under the unitary cavity–qubit interaction, the Kerr medium and the Stark shift. The population inversion of a qubit presents periodic revivals and collapses. The results show that the entanglement and the population inversion as well as the inversion have the same stable intervals, that is, the collapse intervals. It is found that the Kerr medium and the Stark shift may lead to reduction of the periods and the amplitudes of the population inversion and the cavity–qubit/qubit–qubit entanglement. The deteriorated qubit–qubit/cavity–qubit entanglement and the population inversion, due to the Kerr medium, may be increased by increasing the Stark shift and vice versa.

Electromagnetic field in the nucleus and the Salam–Strathdee phase transitions

1978 ◽  
Vol 56 (1) ◽  
pp. 149-160 ◽  
Author(s):  
H. C. Lee ◽  
F. C. Khanna
Keyword(s):  
Phase Transition ◽  
Electromagnetic Field ◽  
Phase Transitions ◽  
Electromagnetic Fields ◽  
Normal Values ◽  
Cabibbo Angle ◽  
Existing Data

Electromagnetic fields in the interior of the nucleus (hypernucleus) as well as inside the constituent nucleons (hyperons) are calculated. The results are discussed in the context of the Salam–Strathdee phase transition in connection with the possible vanishing of the Cabibbo angle. We show that existing data constrain the minimal range of 'normal' values for the invariant [Formula: see text] to be [Formula: see text]. Interestingly, in many Λ-hypernuclei [Formula: see text] is outside this minimal range.

Formation mechanisms and structure of the luminescence spectra of a dense resonant medium

1998 ◽  
Vol 87 (1) ◽  
pp. 76-86 ◽  
Author(s):  
Yu. K. Zemtsov ◽  
A. Yu. Sechin ◽  
A. N. Starostin ◽  
A. G. Leonov ◽  
A. A. Rudenko ◽  
...  
Keyword(s):  
Resonant Medium ◽  
Luminescence Spectra ◽  
Formation Mechanisms ◽  
Dense Resonant Medium

scholarly journals Population inversion and dynamical phase transitions in a driven superconductor

2018 ◽  
Vol 98 (21) ◽  
Author(s):  
H. P. Ojeda Collado ◽  
José Lorenzana ◽  
Gonzalo Usaj ◽  
C. A. Balseiro
Keyword(s):  
Phase Transitions ◽  
Population Inversion ◽  
Dynamical Phase ◽  
Dynamical Phase Transitions

Laser Assisted Cherenkov Emission in Resonant Media

2001 ◽  
Vol 56 (1-2) ◽  
pp. 169-172 ◽  
Author(s):  
M. Artoni ◽  
I. Carusotto ◽  
G. C. La Rocca ◽  
F. Bassani
Keyword(s):  
Electromagnetic Field ◽  
Cuprous Oxide ◽  
Cherenkov Radiation ◽  
External Electromagnetic Field ◽  
Resonant Medium ◽  
75.50 Lk ◽  
At Resonance ◽  
Emission Yield

Abstract We theoretically examine the behaviour of Cherenkov radiation in a lossy, dispersive and resonant medium when emission is assisted by an external electromagnetic field. Under the appropriate coherence conditions for Cherenkov emission, we anticipate a large increase of the emission yield at resonance. Our predictions are implemented by numerical estimates for cuprous oxide (Cu20 ). Pacs: 61.43.Fs, 77.22.Ch, 75.50.Lk

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