Open AccessEntanglement of two dipole-couples qubits induced by a thermal field of a cavity with Kerr medium
Author(s) -
Rodion K. Zakharov,
Rodion K. Zakharov,
Eugene K. Bashkirov,
Eugene K. Bashkirov
Publication year - 2021
Publication title -
fizika volnovyh processov i radiotehničeskie sistemy
Language(s) - English
Resource type - Journals
eISSN - 2782-294X
pISSN - 1810-3189
DOI - 10.18469/1810-3189.2021.24.3.9-17
Subject(s) - qubit , quantum entanglement , physics , density matrix , quantum mechanics , dipole , superconducting quantum computing , field (mathematics) , condensed matter physics , jaynes–cummings model , quantum electrodynamics , quantum , quantum optics , mathematics , pure mathematics
In the present work, we investigated the dynamics of two identical superconducting qubits interacting with the mode of the quantum electromagnetic field of a microwave coplanar cavity with a Kerr medium in the presence of an effective dipole-dipole interaction of the qubits. We have found an exact solution of the quantum Liouville equation for the complete density matrix of the system under consideration for the Fock and thermal chaotic initial states of the cavityr field. The exact solution for the full density matrix was used to determine the reduced qubit density matrix and to calculate the entanglement parameter concurrence. Computer simulation of the time dependence of the concurrshowed that for certain initial states of qubits, their entanglement can be significantly increased in the presence of a Kerr medium and direct dipole-dipole interaction.