Decoherence of Bell states by local interactions with a dynamic spin environment
We study the evolution of a system of two qubits, each of which interacts locally with a spin chain with nontrivial internal Hamiltonian. We present an exact solution to this problem and analyze the dependence of decoherence on the distance between the interaction sites. In the strong coupling regim...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_10502947_v78_n1_p_Cormick |
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todo:paper_10502947_v78_n1_p_Cormick2023-10-03T15:59:57Z Decoherence of Bell states by local interactions with a dynamic spin environment Cormick, C. Paz, J.P. Spin dynamics Bell states Correlation lengths Decoherence Exact solutions Hamiltonian Initial states Interaction sites Ising chains Local interactions Non-markovian effects Numerica l results Spin chains Strong couplings Strong-coupling regime Time scaling Weak-coupling regime Flow interactions We study the evolution of a system of two qubits, each of which interacts locally with a spin chain with nontrivial internal Hamiltonian. We present an exact solution to this problem and analyze the dependence of decoherence on the distance between the interaction sites. In the strong coupling regime we find that decoherence increases with increasing distance. In the weak coupling regime the dependence of decoherence with distance is not generic (i.e., it varies according to the initial state). Decoherence becomes independent of distance when the latter is over a saturation length l. Numerical results for the Ising chain suggest that the saturation scale is related to the correlation length ξ. For strong coupling we display evidence of the existence of non-Markovian effects (such as environment-induced interactions between the qubits). As a consequence the system can undergo a quasiperiodic sequence of "sudden deaths and revivals" of entanglement, with a time scale related to the distance between qubits. © 2008 The American Physical Society. Fil:Cormick, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Paz, J.P. 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_v78_n1_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 |
Spin dynamics Bell states Correlation lengths Decoherence Exact solutions Hamiltonian Initial states Interaction sites Ising chains Local interactions Non-markovian effects Numerica l results Spin chains Strong couplings Strong-coupling regime Time scaling Weak-coupling regime Flow interactions |
| spellingShingle |
Spin dynamics Bell states Correlation lengths Decoherence Exact solutions Hamiltonian Initial states Interaction sites Ising chains Local interactions Non-markovian effects Numerica l results Spin chains Strong couplings Strong-coupling regime Time scaling Weak-coupling regime Flow interactions Cormick, C. Paz, J.P. Decoherence of Bell states by local interactions with a dynamic spin environment |
| topic_facet |
Spin dynamics Bell states Correlation lengths Decoherence Exact solutions Hamiltonian Initial states Interaction sites Ising chains Local interactions Non-markovian effects Numerica l results Spin chains Strong couplings Strong-coupling regime Time scaling Weak-coupling regime Flow interactions |
| description |
We study the evolution of a system of two qubits, each of which interacts locally with a spin chain with nontrivial internal Hamiltonian. We present an exact solution to this problem and analyze the dependence of decoherence on the distance between the interaction sites. In the strong coupling regime we find that decoherence increases with increasing distance. In the weak coupling regime the dependence of decoherence with distance is not generic (i.e., it varies according to the initial state). Decoherence becomes independent of distance when the latter is over a saturation length l. Numerical results for the Ising chain suggest that the saturation scale is related to the correlation length ξ. For strong coupling we display evidence of the existence of non-Markovian effects (such as environment-induced interactions between the qubits). As a consequence the system can undergo a quasiperiodic sequence of "sudden deaths and revivals" of entanglement, with a time scale related to the distance between qubits. © 2008 The American Physical Society. |
| format |
JOUR |
| author |
Cormick, C. Paz, J.P. |
| author_facet |
Cormick, C. Paz, J.P. |
| author_sort |
Cormick, C. |
| title |
Decoherence of Bell states by local interactions with a dynamic spin environment |
| title_short |
Decoherence of Bell states by local interactions with a dynamic spin environment |
| title_full |
Decoherence of Bell states by local interactions with a dynamic spin environment |
| title_fullStr |
Decoherence of Bell states by local interactions with a dynamic spin environment |
| title_full_unstemmed |
Decoherence of Bell states by local interactions with a dynamic spin environment |
| title_sort |
decoherence of bell states by local interactions with a dynamic spin environment |
| url |
http://hdl.handle.net/20.500.12110/paper_10502947_v78_n1_p_Cormick |
| work_keys_str_mv |
AT cormickc decoherenceofbellstatesbylocalinteractionswithadynamicspinenvironment AT pazjp decoherenceofbellstatesbylocalinteractionswithadynamicspinenvironment |
| _version_ |
1807320796857630720 |