Steady state thermodynamics of two qubits strongly coupled to bosonic environments
When a quantum system is placed in thermal environments, we often assume that the system relaxes to the Gibbs state in which decoherence takes place in the system energy eigenbasis. However, when the coupling between the system and the environments is strong, the stationary state is not necessarily...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2019-10-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.1.033018 |
| _version_ | 1827286392777998336 |
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| author | Ketan Goyal Ryoichi Kawai |
| author_facet | Ketan Goyal Ryoichi Kawai |
| author_sort | Ketan Goyal |
| collection | DOAJ |
| description | When a quantum system is placed in thermal environments, we often assume that the system relaxes to the Gibbs state in which decoherence takes place in the system energy eigenbasis. However, when the coupling between the system and the environments is strong, the stationary state is not necessarily the Gibbs state due to environment-induced decoherence, which can be interpreted as a continuous measurement by the environment. Based on the einselection proposed by Zurek, we postulate that the Gibbs state is projected onto the pointer basis due to the continuous measurement. We justify the proposition by exact numerical simulation of a pair of coupled qubits interacting with boson gases. Furthermore, we demonstrate that heat conduction in nonequilibrium steady states can be suppressed in the strong coupling limit also by the environment-induced decoherence. |
| first_indexed | 2024-04-24T10:30:32Z |
| format | Article |
| id | doaj.art-b32496682c22474583353544a0ee4249 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:30:32Z |
| publishDate | 2019-10-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-b32496682c22474583353544a0ee42492024-04-12T16:46:04ZengAmerican Physical SocietyPhysical Review Research2643-15642019-10-011303301810.1103/PhysRevResearch.1.033018Steady state thermodynamics of two qubits strongly coupled to bosonic environmentsKetan GoyalRyoichi KawaiWhen a quantum system is placed in thermal environments, we often assume that the system relaxes to the Gibbs state in which decoherence takes place in the system energy eigenbasis. However, when the coupling between the system and the environments is strong, the stationary state is not necessarily the Gibbs state due to environment-induced decoherence, which can be interpreted as a continuous measurement by the environment. Based on the einselection proposed by Zurek, we postulate that the Gibbs state is projected onto the pointer basis due to the continuous measurement. We justify the proposition by exact numerical simulation of a pair of coupled qubits interacting with boson gases. Furthermore, we demonstrate that heat conduction in nonequilibrium steady states can be suppressed in the strong coupling limit also by the environment-induced decoherence.http://doi.org/10.1103/PhysRevResearch.1.033018 |
| spellingShingle | Ketan Goyal Ryoichi Kawai Steady state thermodynamics of two qubits strongly coupled to bosonic environments Physical Review Research |
| title | Steady state thermodynamics of two qubits strongly coupled to bosonic environments |
| title_full | Steady state thermodynamics of two qubits strongly coupled to bosonic environments |
| title_fullStr | Steady state thermodynamics of two qubits strongly coupled to bosonic environments |
| title_full_unstemmed | Steady state thermodynamics of two qubits strongly coupled to bosonic environments |
| title_short | Steady state thermodynamics of two qubits strongly coupled to bosonic environments |
| title_sort | steady state thermodynamics of two qubits strongly coupled to bosonic environments |
| url | http://doi.org/10.1103/PhysRevResearch.1.033018 |
| work_keys_str_mv | AT ketangoyal steadystatethermodynamicsoftwoqubitsstronglycoupledtobosonicenvironments AT ryoichikawai steadystatethermodynamicsoftwoqubitsstronglycoupledtobosonicenvironments |