INFLUENCE OF SUPERPOSITION OF COHERENT STATES OF LIGHT ON THE EVOLUTION OF THE FIELD ENTROPY AND ENTANGLEMENT IN THE INTENSITY-DEPENDENT JCM

We investigate the influence of superposition of coherent states of light on population inversion and the evolution of the field entropy for two-level atoms in the framework of the Jaynes–Cummings model. We compare the behavior of the system in the case of having a coherent superposition state and a statistical mixture of coherent states as an initial field. Our results show that the superposition of coherent states plays an important role in the evolution of the field entropy in the intensity-dependent Jaynes–Cummings model (JCM).

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SUB-ENTROPIES AND PHASE PROPERTIES UNDERGOING THE EFFECTS OF ATOMIC MOTION FOR THE JAYNES–CUMMINGS MODEL WITH INITIAL MIXED STATE INPUT

International Journal of Quantum Information ◽

10.1142/s0219749906002158 ◽

2006 ◽

Vol 04 (05) ◽

pp. 871-882 ◽

Cited By ~ 3

Author(s):

A.-S. F. OBADA ◽

H. A. HESSIAN ◽

A.-B. A. MOHAMED

Keyword(s):

Mixed State ◽

Coherent States ◽

Atomic Motion ◽

Superposition State ◽

Mode Structure ◽

Initial State ◽

Initial Field ◽

Field Mode ◽

Intensity Dependent Coupling ◽

Phase Properties

An analytical method to calculate the sub-entropies and entanglement for the mixed state as an initial field is presented. Also, we investigate the effects of the atomic motion and the field-mode structure on sub-entropies and phase properties of the coherent superposition state and a statistical mixture of coherent states as initial field states taking into account different forms of the intensity-dependent coupling. The initial state, the atomic motion and the field-mode structure play important roles in the time evolution of the entropies, entanglement and phase properties.

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Creation of an arbitrary coherent superposition state with chirped delayed pulses

Journal of Physics B Atomic Molecular and Optical Physics ◽

10.1088/0953-4075/43/3/035401 ◽

2010 ◽

Vol 43 (3) ◽

pp. 035401 ◽

Cited By ~ 8

Author(s):

Deng Li ◽

Niu Yueping ◽

Xiang yang ◽

Jin Shiqi ◽

Gong Shangqing

Keyword(s):

Superposition State ◽

Coherent Superposition

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High-order Harmonic Generation from Hydrogen Molecular Ion in Coherent Superposition State

Communications in Physics ◽

10.15625/0868-3166/30/2/14682 ◽

2020 ◽

Vol 30 (2) ◽

pp. 99

Author(s):

Ngoc-Loan Phan

Keyword(s):

Harmonic Generation ◽

Ground State ◽

Interference Effect ◽

High Order ◽

Intense Laser ◽

Superposition State ◽

High Order Harmonic Generation ◽

Coherent Superposition ◽

High Order Harmonic ◽

Depletion Effect

Atom in a coherent superposition state reveals an advantage in the enhancement conversion efficiency of high-order harmonic generation (HHG), which is meaningful in producing attosecond pulses. In this study, we expand to investigate a more complicated system, H\(_2^+\) molecule in the superposition of the ground and second excited states, exposed to an ultrashort intense laser pulse by numerically solving the time-dependent Schrödinger equation. Firstly, we examine the enhancement of HHG from this system. Then, we study the depletion effect on the cutoff energy of HHG spectra with the coherent superposition state. We found that these effects on the HHG from molecules are similar to those from atoms. Finally, we study the signature of the interesting effect, which is absent for atoms -- two-center interference effect in the HHG from H\(_2^+\) in the coherent superposition state. We recognize that the minimum positions in HHG from molecules in the superposition state, and in the pure ground state are the same. Especially, for weak laser intensity, in the HHG with the superposition state, the minimum due to the interference effect is apparent, while it is invisible in the HHG from pure ground state. As a result, in comparison with the ground-state molecule, the coherent molecule can be used as a more accurate tool to determine the internuclear distance of molecule.

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