Geodesic
Entanglement in nonlinear two-qubit Tavis~--- Cummings model
Vestnik Samarskogo universiteta. Estestvennonaučnaâ seriâ, Tome 29 (2023) no. 2, pp. 72-80

Voir la notice de l'article provenant de la source Math-Net.Ru

In this work, we have studied the dynamics of entanglement of two identical superconducting qubits resonantly interacting with the one-mode field of a coplanar microwave cavity without loss through single-photon transitions in the presence of third- and fifth-order nonlinearities. Based on the solution of the equation of evolution of the system for the Fock initial states of the cavity field, the criterion of qubits entanglement – negativity is calculated. The results of the negativity calculation show that for the initial separable states, the cavity nonlinearity can lead to a significant increase in the maximum degree of qubit entanglement. It is shown that for the initial entangled states of qubits and intense cavity fields, taking into account nonlinearities leads to stabilization of the degree of entanglement of qubits in the cavity and contributes to the disappearance of the effect of the entanglement sudden death of qubits.
Keywords: qubits, resonant interaction, nonlinear cavity, fock state of the cavity field, negativity, sudden death of entanglement.
Mots-clés : entanglement 
@article{VSGU_2023_29_2_a6,
     author = {R. K. Zakharov and E. K. Bashkirov},
     title = {Entanglement in nonlinear two-qubit {Tavis~---} {Cummings} model},
     journal = {Vestnik Samarskogo universiteta. Estestvennonau\v{c}na\^a seri\^a},
     pages = {72--80},
     publisher = {mathdoc},
     volume = {29},
     number = {2},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGU_2023_29_2_a6/}
}
TY  - JOUR
AU  - R. K. Zakharov
AU  - E. K. Bashkirov
TI  - Entanglement in nonlinear two-qubit Tavis~--- Cummings model
JO  - Vestnik Samarskogo universiteta. Estestvennonaučnaâ seriâ
PY  - 2023
SP  - 72
EP  - 80
VL  - 29
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/VSGU_2023_29_2_a6/
LA  - ru
ID  - VSGU_2023_29_2_a6
ER  - 
%0 Journal Article
%A R. K. Zakharov
%A E. K. Bashkirov
%T Entanglement in nonlinear two-qubit Tavis~--- Cummings model
%J Vestnik Samarskogo universiteta. Estestvennonaučnaâ seriâ
%D 2023
%P 72-80
%V 29
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/VSGU_2023_29_2_a6/
%G ru
%F VSGU_2023_29_2_a6
R. K. Zakharov; E. K. Bashkirov. Entanglement in nonlinear two-qubit Tavis~--- Cummings model. Vestnik Samarskogo universiteta. Estestvennonaučnaâ seriâ, Tome 29 (2023) no. 2, pp. 72-80. http://geodesic.mathdoc.fr/item/VSGU_2023_29_2_a6/