Thermal entanglement in the three-qubit Tavis-Cummings model with Kerr nonlinearity

We obtained a solution of the Liouville equation for a system of three identical qubits interacting without detuning with a thermal field of a cavity with a Kerr medium, for two type of initial pure genuine W-entangled qubits states. On its basis, three entanglement parameters: fidelity, tangle and...

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Bibliographic Details
Published inKompʹûternaâ optika Vol. 49; no. 1; pp. 53 - 59
Main Authors Bagrov, A.R., Bashkirov, E.K.
Format Journal Article
LanguageEnglish
Published Samara National Research University 01.02.2025
Subjects
cavity
entanglement
fidelity
kerr nonlinearity
negativity
qubits
sudden death of entanglement
tangle
thermal field
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Summary:We obtained a solution of the Liouville equation for a system of three identical qubits interacting without detuning with a thermal field of a cavity with a Kerr medium, for two type of initial pure genuine W-entangled qubits states. On its basis, three entanglement parameters: fidelity, tangle and pairwise negativities were calculated. We obtained that sudden death of entanglement takes place for large intensities of the cavity thermal noise for all considered W-states. We also showed that Kerr nonlinearity prevents the destruction of the initial qubits entanglement induced by the thermal noise of the cavity and eliminates the sudden death of entanglement.
ISSN:0134-2452
2412-6179
DOI:10.18287/2412-6179-CO-1544