Dynamics of three qubits not-resonantly interacting with one-mode cavity field
Eugene K. Bashkirov, Alexander R..Bagrov, Ilya V. Vasiliev, Samara University, Samara
Abstract
n this talk, we investigated the dynamics of three two-level atoms (qubits) not-resonantly interacting with one-mde quantum electromagnetic field of lossless cavity.
We derived the solution of the quantum Liuville equation for different separable and entangled states of the qubits and different pure and mixed states of the electromagnetiv field In the resonant case we used the explicit form of the evolution operator of the three-atom Tavis–Cummings model which have been derived earlier by Cai J.-F. and Liu H.-P.
(Commun. Theor. Phys., 2005). For not-resonant case, we limited ourselves to numerical simulation of the Liuville equation. Using these solutions we calculated the two-qubit negativity as a measure of qubit-qubit entanglement. It is shown that detuning can greatly
enhance the maximum degree of qubit-qubit entanglement and can eliminate the sudden death of entanglement.
Speaker
Eugene K. Bashkirov
Samara University, Samara
Russia
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