Entanglement between two qubits interacting with a slightly detuned thermal field

Eugene K. Bashkirov

Eugene K. Bashkirov

In this paper, we investigate entanglement between two qubits when they simultaneously not-resonantly interact with a single-mode thermal field through the degenerate two-photon transitions. We obtain the exact solution of the quantum Liouville equation for density matrix of the considered systems in the "dressed" states representation. On its basis the calculate the qubit-qubit reduced density matrix and negativity. We show that a slight detuning between the qubit transition frequency and the twice field frequency might cause high entanglement between the qubits.

G. Lagmago Kamta, Andrei Y. Istomin, Anthony F. Starace

Eugene K. Bashkirov, Башкиров Е. К, A. M Vorobiev +1 more

In this paper we have investigated the dynamics of entanglement of two identical qubits nonresonantly interacting with one mode of a thermal electromagnetic field in lossless resonator in the presence of a direct dipole-dipole interaction. On the basis of the exact solution of the considered model, the Peres-Horodetskii entanglement parameter (negativity) for qubits has been found. Numerical simulation of the negativity for various model parameters has been carried out. It has been shown that the interaction of qubits with the thermal field of the resonator can lead to their entanglement. It ha been established that the detuning and dipole-dipole interaction of qubits can be used to manipulate and control the degree of their entanglement.

Mohammad Mehdi Sahrapour, Nancy Makri

Xiufeng Li, Mao-Fa Fang