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Momentum-Space Decoherence of Distinguishable and Identical Particles in the Caldeira–Leggett Formalism

In this work, momentum-space decoherence using minimum and nonminimum-uncertainty-product (stretched) Gaussian wave packets in the framework of Caldeira–Leggett formalism and under the presence of a linear potential is studied. As a dimensionless measure of decoherence, purity, a quantity appearing...

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Autores principales: Khani, Z., Mousavi, S. V., Miret-Artés, S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8619036/
https://www.ncbi.nlm.nih.gov/pubmed/34828167
http://dx.doi.org/10.3390/e23111469
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author Khani, Z.
Mousavi, S. V.
Miret-Artés, S.
author_facet Khani, Z.
Mousavi, S. V.
Miret-Artés, S.
author_sort Khani, Z.
collection PubMed
description In this work, momentum-space decoherence using minimum and nonminimum-uncertainty-product (stretched) Gaussian wave packets in the framework of Caldeira–Leggett formalism and under the presence of a linear potential is studied. As a dimensionless measure of decoherence, purity, a quantity appearing in the definition of the linear entropy, is studied taking into account the role of the stretching parameter. Special emphasis is on the open dynamics of the well-known cat states and bosons and fermions compared to distinguishable particles. For the cat state, while the stretching parameter speeds up the decoherence, the external linear potential strength does not affect the decoherence time; only the interference pattern is shifted. Furthermore, the interference pattern is not observed for minimum-uncertainty-product-Gaussian wave packets in the momentum space. Concerning bosons and fermions, the question we have addressed is how the symmetry of the wave functions of indistinguishable particles is manifested in the decoherence process, which is understood here as the loss of being indistinguishable due to the gradual emergence of classical statistics with time. We have observed that the initial bunching and anti-bunching character of bosons and fermions, respectively, in the momentum space are not preserved as a function of the environmental parameters, temperature, and damping constant. However, fermionic distributions are slightly broader than the distinguishable ones and these similar to the bosonic distributions. This general behavior could be interpreted as a residual reminder of the symmetry of the wave functions in the momentum space for this open dynamics.
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spelling pubmed-86190362021-11-27 Momentum-Space Decoherence of Distinguishable and Identical Particles in the Caldeira–Leggett Formalism Khani, Z. Mousavi, S. V. Miret-Artés, S. Entropy (Basel) Article In this work, momentum-space decoherence using minimum and nonminimum-uncertainty-product (stretched) Gaussian wave packets in the framework of Caldeira–Leggett formalism and under the presence of a linear potential is studied. As a dimensionless measure of decoherence, purity, a quantity appearing in the definition of the linear entropy, is studied taking into account the role of the stretching parameter. Special emphasis is on the open dynamics of the well-known cat states and bosons and fermions compared to distinguishable particles. For the cat state, while the stretching parameter speeds up the decoherence, the external linear potential strength does not affect the decoherence time; only the interference pattern is shifted. Furthermore, the interference pattern is not observed for minimum-uncertainty-product-Gaussian wave packets in the momentum space. Concerning bosons and fermions, the question we have addressed is how the symmetry of the wave functions of indistinguishable particles is manifested in the decoherence process, which is understood here as the loss of being indistinguishable due to the gradual emergence of classical statistics with time. We have observed that the initial bunching and anti-bunching character of bosons and fermions, respectively, in the momentum space are not preserved as a function of the environmental parameters, temperature, and damping constant. However, fermionic distributions are slightly broader than the distinguishable ones and these similar to the bosonic distributions. This general behavior could be interpreted as a residual reminder of the symmetry of the wave functions in the momentum space for this open dynamics. MDPI 2021-11-07 /pmc/articles/PMC8619036/ /pubmed/34828167 http://dx.doi.org/10.3390/e23111469 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Khani, Z.
Mousavi, S. V.
Miret-Artés, S.
Momentum-Space Decoherence of Distinguishable and Identical Particles in the Caldeira–Leggett Formalism
title Momentum-Space Decoherence of Distinguishable and Identical Particles in the Caldeira–Leggett Formalism
title_full Momentum-Space Decoherence of Distinguishable and Identical Particles in the Caldeira–Leggett Formalism
title_fullStr Momentum-Space Decoherence of Distinguishable and Identical Particles in the Caldeira–Leggett Formalism
title_full_unstemmed Momentum-Space Decoherence of Distinguishable and Identical Particles in the Caldeira–Leggett Formalism
title_short Momentum-Space Decoherence of Distinguishable and Identical Particles in the Caldeira–Leggett Formalism
title_sort momentum-space decoherence of distinguishable and identical particles in the caldeira–leggett formalism
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8619036/
https://www.ncbi.nlm.nih.gov/pubmed/34828167
http://dx.doi.org/10.3390/e23111469
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