Entanglement in three-qubit nonlinear Tavis-Cummings model

Abstract

In this talk, we consider the dynamics of three identical qubits interacting resonantly with a thermal field of an ideal resonator via two-photon processes. We have found the solutions of the quantum equation for the unitary operator of a system under consideration for the initial separable, biseparable, and genuine entangled states of the qubits and the thermal initial state of the resonator field. By averaging the total density matrix over the variables of the resonator field and the variables of one of the qubits, we found the reduced density matrix of the pair of remaining qubits. Two-qubit density matrices were used to calculate the qubit-qubit negativity. The results showed that nonlinear interaction can greatly enhance the amout of entanglement.

Speaker

Eugene K. Bashkirov
Samara University
Russia

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