International Physics Conference.St. Petersburg, October 21-25, 2024, St. Petersburg
Quantum optics

Dynamics of entangled states in the three-qubit Tavis–Cummings model

A. R. Bagrov, E. K. Bashkirov

Samara National Research University, Samara, Russia

Abstract: A model consisting of three identical qubits is investigated, one of which is in a free state, and the other two are locked in an ideal resonator with a Kerr medium and interact resonantly with the selected mode of this resonator. The degree of coincidence is calculated for two genuine entangled W-type states and the GHZ-type state and the thermal state of the resonator field. The influence of the resonator thermal noise intensity and Kerr nonlinearity on the degree of coincidence of qubit states is investigated. It is shown that the thermal field of the resonator does not completely destroy the initial entangled states of the qubits, even for relatively high intensities of thermal noise of the resonator. It is also established that the Kerr nonlinearity of the resonator leads to stabilization of the initial entanglement of qubits.

Keywords: oubits, genuine entangled W- and GHZ-type states, thermal field, Kerr nonlinearity, degree of coincidence of qubit states.

Received: 03.05.2024
Revised: 04.07.2024
Accepted: 30.10.2024

DOI: 10.61011/OS.2024.11.59498.6586-24

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