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Volume 26 - ICOP & ICPET 2020
ICOP & ICPET _ INPC _ ICOFS 2020, 26 - ICOP & ICPET 2020: 697-700 |
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Setodeh Kheirabady M, Rafeie M, Tavassoly M K. The Influence of atom-field nonlinear coupling on the two- qubit entanglement: Intensity-dependent time evolution operator approach. ICOP & ICPET _ INPC _ ICOFS 2020; 26 :697-700
URL: http://opsi.ir/article-1-2160-en.html
URL: http://opsi.ir/article-1-2160-en.html
1- Optics and Laser Group, Faculty of Physics, Yazd University
Abstract: (1413 Views)
In this paper we study the dynamics of entanglement between two qubits (two-level atoms) when the atom–field interaction is intensity-dependent, At first we determine the model and its Hamiltonian, then, using the interaction picture of the Hamiltonian, the intensity-dependent time evolution Hamiltonian operator is obtained in the basis of two qubits. Using this operator, density operator evolution is achieved. With the help of the reduced density matrix, we evaluate the concurrence measure of the two-qubits. At last, by numerical analysis, the influence of intensity-dependent coupling is investigated and compared with linear regime (constant coupling). We observe that in the case of nonlinear coupling, comparing with constant coupling, preservation of entanglement can be achieved.
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