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Thermal entanglement in the three-qubit Tavis-Cummings model with Kerr nonlinearity
A.R. Bagrov 1, E.K. Bashkirov 1

1 Samara National Research University,
443086, Samara, Russia, Moskovskoye shosse 34

 PDF, 1460 kB

DOI: 10.18287/2412-6179-CO-1544

Pages: 53-59.

Full text of article: English language.

Abstract:
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.

Keywords:
qubits, cavity, thermal field, entanglement, fidelity, tangle, negativity, Kerr nonlinearity, sudden death of entanglement.

Citation:
Bagrov AR, Bashkirov EK. Thermal entanglement in the three-qubit Tavis-Cummings model with Kerr nonlinearity. Computer Optics 2025; 49(1): 53-59. DOI: 10.18287/2412-6179-CO-1544.

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