Email this article Entanglement of atoms induced by thermal noise in the presence of initial atomic coherence
- Authors: Bashkirov E.1
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Affiliations:
- Samara National Research University
- Issue: Vol 23, No 3 (2020)
- Pages: 10-17
- Section: Articles
- URL: https://journals.ssau.ru/pwp/article/view/8232
- DOI: https://doi.org/10.18469/1810-3189.2020.23.3.10-17
- ID: 8232
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Abstract
In this article, author investigated the dynamics of entanglement of two dipole-coupled natural or artificial two-level atoms (qubits) interacting nonresonantly with the intensive one-mode cavity thermal field. Author found an exact solution of the quantum Liouville equation for the full density matrix of the system «two atoms + field mode» for a coherent initial state of atoms in the «dressed states» representation. The full system density matrix is used to calculate the two-atom reduced density matrix and to calculate the quantitative criterion for atom-atom entanglement ‒ negativity. The results of computer simulation of the time dependence of negativity showed that in the case of a model with nonresonant interaction, the presence of initial atomic coherence leads to a significant decrease in the maximum degree of atomic entanglement, in contrast to the model with resonant interaction of atoms and a field. For the resonance model, the initial atomic coherence greatly enhances the degree of atomic entanglement.
About the authors
Evgeny K. Bashkirov
Samara National Research University
Author for correspondence.
Email: bash@samsu.ru
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