The effect of finite bandwidth squeezed light on entanglement creation in the Dicke model

We analyse the relation between local two-atom and total multi-atom entanglements in the Dicke system composed of a large number of atoms. We use concurrence as a measure of entanglement between two atoms in the multi-atom system, and the spin squeezing parameter as a measure of entanglement in the...

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Main Authors:	Messikh, Azeddin, Wahiddin, Mohamed Ridza, Pah, Chin Hee, Ficek, Zbigniew
Format:	Article
Language:	English
Published:	Institute of Physics Publishing 2004
Subjects:	QC Physics
Online Access:	http://irep.iium.edu.my/13342/ http://irep.iium.edu.my/13342/ http://irep.iium.edu.my/13342/ http://irep.iium.edu.my/13342/1/The-effect-of-finite-bandwidth-squeezed-light-on-entanglement-creation-in-the-Dicke-model_2004_Journal-of-Optics-B-Quantum-and-Semiclassical-Optics.pdf

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spelling	iium-133422012-05-29T03:13:55Z http://irep.iium.edu.my/13342/ The effect of finite bandwidth squeezed light on entanglement creation in the Dicke model Messikh, Azeddin Wahiddin, Mohamed Ridza Pah, Chin Hee Ficek, Zbigniew QC Physics We analyse the relation between local two-atom and total multi-atom entanglements in the Dicke system composed of a large number of atoms. We use concurrence as a measure of entanglement between two atoms in the multi-atom system, and the spin squeezing parameter as a measure of entanglement in the whole n-atom system. In addition, the influence of the squeezing phase and bandwidth on entanglement in the steady-state Dicke system is discussed. It is shown that the introduction of a squeezed field leads to a significant enhancement of entanglement between two atoms, and the entanglement increases with increasing degree of squeezing and bandwidth of the incident squeezed field. In the presence of a coherent field the entanglement exhibits a strong dependence on the relative phase between the squeezed and coherent fields, that can jump quite rapidly from unentangled to strongly entangled values when the phase changes from zero to π. We find that the jump of the degree of entanglement is due to a flip of the spin squeezing from one quadrature component of the atomic spin to the other component when the phase changes from zero to π. We also analyse the dependence of the entanglement on the number of atoms and find that, despite the reduction in the degree of entanglement between two atoms, a large entanglement is present in the whole n-atom system and the degree of entanglement increases as the number of atoms increases. Institute of Physics Publishing 2004 Article PeerReviewed application/pdf en http://irep.iium.edu.my/13342/1/The-effect-of-finite-bandwidth-squeezed-light-on-entanglement-creation-in-the-Dicke-model_2004_Journal-of-Optics-B-Quantum-and-Semiclassical-Optics.pdf Messikh, Azeddin and Wahiddin, Mohamed Ridza and Pah, Chin Hee and Ficek, Zbigniew (2004) The effect of finite bandwidth squeezed light on entanglement creation in the Dicke model. Journal of Optics B: Quantum and Semiclassical Optics, 6 (7). pp. 289-295. ISSN 1464-4266 (P), 1741-3575 (O) http://dx.doi.org/10.1088/1464-4266/6/7/005 10.1088/1464-4266/6/7/005
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	QC Physics
spellingShingle	QC Physics Messikh, Azeddin Wahiddin, Mohamed Ridza Pah, Chin Hee Ficek, Zbigniew The effect of finite bandwidth squeezed light on entanglement creation in the Dicke model
description	We analyse the relation between local two-atom and total multi-atom entanglements in the Dicke system composed of a large number of atoms. We use concurrence as a measure of entanglement between two atoms in the multi-atom system, and the spin squeezing parameter as a measure of entanglement in the whole n-atom system. In addition, the influence of the squeezing phase and bandwidth on entanglement in the steady-state Dicke system is discussed. It is shown that the introduction of a squeezed field leads to a significant enhancement of entanglement between two atoms, and the entanglement increases with increasing degree of squeezing and bandwidth of the incident squeezed field. In the presence of a coherent field the entanglement exhibits a strong dependence on the relative phase between the squeezed and coherent fields, that can jump quite rapidly from unentangled to strongly entangled values when the phase changes from zero to π. We find that the jump of the degree of entanglement is due to a flip of the spin squeezing from one quadrature component of the atomic spin to the other component when the phase changes from zero to π. We also analyse the dependence of the entanglement on the number of atoms and find that, despite the reduction in the degree of entanglement between two atoms, a large entanglement is present in the whole n-atom system and the degree of entanglement increases as the number of atoms increases.
format	Article
author	Messikh, Azeddin Wahiddin, Mohamed Ridza Pah, Chin Hee Ficek, Zbigniew
author_facet	Messikh, Azeddin Wahiddin, Mohamed Ridza Pah, Chin Hee Ficek, Zbigniew
author_sort	Messikh, Azeddin
title	The effect of finite bandwidth squeezed light on entanglement creation in the Dicke model
title_short	The effect of finite bandwidth squeezed light on entanglement creation in the Dicke model
title_full	The effect of finite bandwidth squeezed light on entanglement creation in the Dicke model
title_fullStr	The effect of finite bandwidth squeezed light on entanglement creation in the Dicke model
title_full_unstemmed	The effect of finite bandwidth squeezed light on entanglement creation in the Dicke model
title_sort	effect of finite bandwidth squeezed light on entanglement creation in the dicke model
publisher	Institute of Physics Publishing
publishDate	2004
url	http://irep.iium.edu.my/13342/ http://irep.iium.edu.my/13342/ http://irep.iium.edu.my/13342/ http://irep.iium.edu.my/13342/1/The-effect-of-finite-bandwidth-squeezed-light-on-entanglement-creation-in-the-Dicke-model_2004_Journal-of-Optics-B-Quantum-and-Semiclassical-Optics.pdf
first_indexed	2023-09-18T20:22:31Z
last_indexed	2023-09-18T20:22:31Z
_version_	1777408201971466240

The effect of finite bandwidth squeezed light on entanglement creation in the Dicke model

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