Sudden death of entanglement induced by a minimal thermal environment

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.

References added; additional figures also included in this version

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Cited by in corpus (4)

• Unbalanced gain and loss in a quantum photonic system
• Quantum coherence, correlations and nonclassical states in the two-qubit Rabi model with parametric oscillator
• Generation and transfer of entangled states between two connected microtoroidal cavities: analysis of different types of coupling
• Two coupled qubits under the influence of a minimal, phase-sensitive environment