Decoherence induced by a dynamic spin environment: The universal regime
This paper analyzes the decoherence induced on a single qubit by the interaction with a spin chain with nontrivial internal dynamics (XY -type interactions). The aim of the paper is to study the existence and properties of the so-called universal regime, in which the decoherence time scale becomes i...
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todo:paper_10502947_v77_n2_p_Cormick2023-10-03T15:59:55Z Decoherence induced by a dynamic spin environment: The universal regime Cormick, C. Pablo Paz, J. Hamiltonians Magnetic couplings Molecular interactions Phase separation Phase transitions Spin dynamics Decoherence Energy scale separation Quantum phase transition Spin chains Quantum theory This paper analyzes the decoherence induced on a single qubit by the interaction with a spin chain with nontrivial internal dynamics (XY -type interactions). The aim of the paper is to study the existence and properties of the so-called universal regime, in which the decoherence time scale becomes independent of the strength of the coupling with the environment. It is shown that, although such a regime does exist, as previously established by Cucchietti [Phys. Rev. A 75, 032337 (2007)], it is not a clear signature of a quantum phase transition in the environment. In fact, this kind of universality also exists in the absence of quantum phase transitions. A universal regime can be related to the existence of an energy scale separation between the Hamiltonian of the environment and the one characterizing the system-environment interaction. The results presented also indicate that in the strong-coupling regime the quantum phase transition does not produce an enhancement of decoherence (as opposed to what happens in the weak-coupling regime). © 2008 The American Physical Society. Fil:Cormick, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pablo Paz, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10502947_v77_n2_p_Cormick |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Hamiltonians Magnetic couplings Molecular interactions Phase separation Phase transitions Spin dynamics Decoherence Energy scale separation Quantum phase transition Spin chains Quantum theory |
| spellingShingle |
Hamiltonians Magnetic couplings Molecular interactions Phase separation Phase transitions Spin dynamics Decoherence Energy scale separation Quantum phase transition Spin chains Quantum theory Cormick, C. Pablo Paz, J. Decoherence induced by a dynamic spin environment: The universal regime |
| topic_facet |
Hamiltonians Magnetic couplings Molecular interactions Phase separation Phase transitions Spin dynamics Decoherence Energy scale separation Quantum phase transition Spin chains Quantum theory |
| description |
This paper analyzes the decoherence induced on a single qubit by the interaction with a spin chain with nontrivial internal dynamics (XY -type interactions). The aim of the paper is to study the existence and properties of the so-called universal regime, in which the decoherence time scale becomes independent of the strength of the coupling with the environment. It is shown that, although such a regime does exist, as previously established by Cucchietti [Phys. Rev. A 75, 032337 (2007)], it is not a clear signature of a quantum phase transition in the environment. In fact, this kind of universality also exists in the absence of quantum phase transitions. A universal regime can be related to the existence of an energy scale separation between the Hamiltonian of the environment and the one characterizing the system-environment interaction. The results presented also indicate that in the strong-coupling regime the quantum phase transition does not produce an enhancement of decoherence (as opposed to what happens in the weak-coupling regime). © 2008 The American Physical Society. |
| format |
JOUR |
| author |
Cormick, C. Pablo Paz, J. |
| author_facet |
Cormick, C. Pablo Paz, J. |
| author_sort |
Cormick, C. |
| title |
Decoherence induced by a dynamic spin environment: The universal regime |
| title_short |
Decoherence induced by a dynamic spin environment: The universal regime |
| title_full |
Decoherence induced by a dynamic spin environment: The universal regime |
| title_fullStr |
Decoherence induced by a dynamic spin environment: The universal regime |
| title_full_unstemmed |
Decoherence induced by a dynamic spin environment: The universal regime |
| title_sort |
decoherence induced by a dynamic spin environment: the universal regime |
| url |
http://hdl.handle.net/20.500.12110/paper_10502947_v77_n2_p_Cormick |
| work_keys_str_mv |
AT cormickc decoherenceinducedbyadynamicspinenvironmenttheuniversalregime AT pablopazj decoherenceinducedbyadynamicspinenvironmenttheuniversalregime |
| _version_ |
1807324548082696192 |