INFORMATION ENTROPY AND SPIN-SQUEEZING IN ATOMIC THREE-LEVEL SYSTEMS

We consider the problem of an atomic three-level system in interaction with a radiation field. The time evolution of the system, in atomic ladder and Λ configurations, is solved exactly assuming a coherent-state as the initial atomic state. We calculate the atomic spin-squeezing, the atomic entropy-squeezing, and their variances. We show that the spin-squeezing and the entropy-squeezing exhibit similar time dependence.

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Some Features on Entropy Squeezing for Two-Level System with a New Nonlinear Coherent State

Journal of Quantum Information Science ◽

10.4236/jqis.2014.41007 ◽

2014 ◽

Vol 04 (01) ◽

pp. 71-81 ◽

Cited By ~ 1

Author(s):

Salama I. Ali ◽

Sayed Abdel-Khalek

Keyword(s):

Coherent State ◽

Level System ◽

Entropy Squeezing

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Density matrix and purity evolution in dissipative two-level systems: II. Relaxation

Physical Chemistry Chemical Physics ◽

10.1039/d0cp05528j ◽

2021 ◽

Author(s):

Sambarta Chatterjee ◽

Nancy Makri

Keyword(s):

Density Matrix ◽

Time Evolution ◽

Reduced Density Matrix ◽

Level System ◽

Two Level Systems ◽

Reduced Density ◽

Harmonic Bath

We investigate the time evolution of the reduced density matrix (RDM) and its purity in the dynamics of a two-level system coupled to a dissipative harmonic bath, when the system is initially placed in one of its eigenstates.

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Quantum information entropy and squeezing of 𝒫𝒯-symmetric potential

Modern Physics Letters A ◽

10.1142/s0217732321500656 ◽

2021 ◽

Vol 36 (10) ◽

pp. 2150065

Author(s):

Aarti Sharma ◽

Pooja Thakur ◽

Girish Kumar ◽

Anil Kumar

Keyword(s):

Phase Transition ◽

Quantum Information ◽

Information Entropy ◽

Momentum Space ◽

Quantum Mechanical ◽

Position Space ◽

Entropy Squeezing ◽

Information Theoretic ◽

Symmetric Potential ◽

Quantum Mechanical Systems

The information theoretic concepts are crucial to study the quantum mechanical systems. In this paper, the information densities of [Formula: see text]-symmetric potential have been demonstrated and their properties deeply analyzed. The position space and momentum space information entropy is obtained and Bialynicki-Birula–Mycielski inequality is saturated for different parameters of the potential. Some interesting features of information entropy have been discussed. The variation in these entropies is described which gets saturated for specific values of the parameter. These have also been analyzed for the [Formula: see text]-symmetry breaking case. Further, the entropy squeezing phenomenon has been investigated in position space as well as momentum space. Interestingly, [Formula: see text] phase transition conjectures the entropy squeezing in position space and momentum space.

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Information Entropy Squeezing and Non-local Correlation Between a Two-Level Atom and Two-Mode Field Under the Classical Field Effect

Frontiers in Physics ◽

10.3389/fphy.2020.00278 ◽

2020 ◽

Vol 8 ◽

Author(s):

E. M. Khalil ◽

Sayed Abdel-Khalek ◽

Waad Albogami ◽

Jamel Bouslimi ◽

Sayed M. Abo-Dahab ◽

...

Keyword(s):

Information Entropy ◽

Field Effect ◽

Classical Field ◽

Local Correlation ◽

Entropy Squeezing ◽

Mode Field ◽

Level Atom ◽

Non Local

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Retrieval of cavity-generated atomic spin squeezing after free-space release

Physical Review A ◽

10.1103/physreva.102.012224 ◽

2020 ◽

Vol 102 (1) ◽

Cited By ~ 1

Author(s):

Yunfan Wu ◽

Rajiv Krishnakumar ◽

Julián Martínez-Rincón ◽

Benjamin K. Malia ◽

Onur Hosten ◽

...

Keyword(s):

Free Space ◽

Spin Squeezing ◽

Atomic Spin

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A FOUR-LEVEL ATOM INTERACTING WITH A SINGLE-MODE CAVITY FIELD: DOUBLE Ξ-CONFIGURATION

Modern Physics Letters B ◽

10.1142/s0217984908016868 ◽

2008 ◽

Vol 22 (26) ◽

pp. 2587-2599 ◽

Cited By ~ 11

Author(s):

N. H. ABDEL-WAHAB

Keyword(s):

Coherent State ◽

Time Evolution ◽

Single Mode ◽

Cavity Field ◽

Field System ◽

Input Field ◽

Level Atom ◽

Constants Of Motion ◽

Q Function ◽

Single Mode Cavity

In this article, the problem of a double Ξ-type four-level atom interacting with a single-mode cavity field is considered. The considered model describes several distinct configurations of a four-level atom. Also, this model includes the detuning parameters of the atom-field system. We obtain the constants of motion and the wavefunction is derived when the atom is initially prepared in the upper state. We used this model for computing a number of the field aspects for the considered system. As an illustration, the model is used for studying the time evolution of the Mandel Q-parameter, amplitude-squared squeezing phenomenon and Q-function when the input field is considered in a coherent state. The results show that these phenomena are affected by the presence of detuning parameters.

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