Activation-Like Processes at Zero Temperature

We examine the possibility that a metastable quantum state could experiment a phenomenon similar to thermal activation but at zero temperature. To do that we study the real-time dynamics of the reduced Wigner function in a simple open quantum system: an anharmonic oscillator with a cubic potential l...

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Detalles Bibliográficos
Publicado: 2003
Materias:
Open quantum systems
Quantum tunneling
Thermal activation
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00207748_v42_n6_p1257_Arteaga
http://hdl.handle.net/20.500.12110/paper_00207748_v42_n6_p1257_Arteaga
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00207748_v42_n6_p1257_Arteaga
record_format dspace
spelling paper:paper_00207748_v42_n6_p1257_Arteaga2023-06-08T14:41:54Z Activation-Like Processes at Zero Temperature Open quantum systems Quantum tunneling Thermal activation We examine the possibility that a metastable quantum state could experiment a phenomenon similar to thermal activation but at zero temperature. To do that we study the real-time dynamics of the reduced Wigner function in a simple open quantum system: an anharmonic oscillator with a cubic potential linearly interacting with an environment of harmonic oscillators. Our results suggest that this activation-like phenomenon exists indeed as a consequence of the fluctuations induced by the environment and that its associated decay rate is comparable to the tunneling rate as computed by the instanton method, atleast for the particular potential of the system and the distribution of frequencies for the environment considered in this paper. However, we are not able to properly deal with the term which leads to tunneling in closed quantum systems, and a definite conclusion cannot be reached until tunneling and activation-like effects are considered simultaneously. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00207748_v42_n6_p1257_Arteaga http://hdl.handle.net/20.500.12110/paper_00207748_v42_n6_p1257_Arteaga
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Open quantum systems
Quantum tunneling
Thermal activation
spellingShingle Open quantum systems
Quantum tunneling
Thermal activation
Activation-Like Processes at Zero Temperature
topic_facet Open quantum systems
Quantum tunneling
Thermal activation
description We examine the possibility that a metastable quantum state could experiment a phenomenon similar to thermal activation but at zero temperature. To do that we study the real-time dynamics of the reduced Wigner function in a simple open quantum system: an anharmonic oscillator with a cubic potential linearly interacting with an environment of harmonic oscillators. Our results suggest that this activation-like phenomenon exists indeed as a consequence of the fluctuations induced by the environment and that its associated decay rate is comparable to the tunneling rate as computed by the instanton method, atleast for the particular potential of the system and the distribution of frequencies for the environment considered in this paper. However, we are not able to properly deal with the term which leads to tunneling in closed quantum systems, and a definite conclusion cannot be reached until tunneling and activation-like effects are considered simultaneously.
title Activation-Like Processes at Zero Temperature
title_short Activation-Like Processes at Zero Temperature
title_full Activation-Like Processes at Zero Temperature
title_fullStr Activation-Like Processes at Zero Temperature
title_full_unstemmed Activation-Like Processes at Zero Temperature
title_sort activation-like processes at zero temperature
publishDate 2003
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00207748_v42_n6_p1257_Arteaga
http://hdl.handle.net/20.500.12110/paper_00207748_v42_n6_p1257_Arteaga
_version_ 1768544671350390784

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