Sudden death of entanglement induced by a minimal thermal environment
- URL: http://arxiv.org/abs/2007.09140v2
- Date: Fri, 31 Jul 2020 14:05:54 GMT
- Title: Sudden death of entanglement induced by a minimal thermal environment
- Authors: G.L. De\c{c}ordi and A. Vidiella-Barranco
- Abstract summary: We study the dynamics of two interacting two-level systems having one of them isolated and the other coupled to a single mode electromagnetic field in a thermal state.
We find that both sudden death and sudden birth of entanglement may occur in such a simple system.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We study the dynamics of two interacting two-level systems (qubits) having
one of them isolated and the other coupled to a single mode electromagnetic
field in a thermal state. The field plays the role of a small environment, in
contrast to the usual approach of modeling an environment via a thermal
reservoir with many degrees of freedom. We find the analytical solution of the
proposed model, which allows us to investigate the consequences of the coupling
to the small environment on characteristic quantum features of the two-qubit
system. We study the time evolution of quantum entanglement and coherence,
verifying the dependence on the relevant coupling constants as well as the
influence of the effective temperature of the environment. Interestingly, we
find that both sudden death and sudden birth of entanglement may occur in such
a simple system. We also discuss a different partition, in which the isolated
qubit is considered to be coupled to a composite environment, constituted by
the other qubit plus the field mode.
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