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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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00207748_v42_n6_p1257_Arteaga |
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todo:paper_00207748_v42_n6_p1257_Arteaga2023-10-03T14:20:20Z Activation-Like Processes at Zero Temperature Arteaga, D. Calzetta, E. Roura, A. Verdaguer, E. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 |
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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 Arteaga, D. Calzetta, E. Roura, A. Verdaguer, E. 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. |
| format |
JOUR |
| author |
Arteaga, D. Calzetta, E. Roura, A. Verdaguer, E. |
| author_facet |
Arteaga, D. Calzetta, E. Roura, A. Verdaguer, E. |
| author_sort |
Arteaga, D. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_00207748_v42_n6_p1257_Arteaga |
| work_keys_str_mv |
AT arteagad activationlikeprocessesatzerotemperature AT calzettae activationlikeprocessesatzerotemperature AT rouraa activationlikeprocessesatzerotemperature AT verdaguere activationlikeprocessesatzerotemperature |
| _version_ |
1807314707272433664 |