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Entanglement dynamics in intensity-dependent double Jaynes-Cummings model for squeezed coherent thermal states
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In this paper, the entanglement dynamics of different subsystems such as atom-atom, atom-field and field-field with radiation field in squeezed coherent thermal states for the intensity-dependent double Jaynes-Cummings model (IDDJCM) and double Jaynes-Cummings model (DJCM) are investigated. The effects of squeezed and thermal photons on entanglement are examined, revealing their complementary roles in shaping the entanglement behavior in both models. One of the main features of the double Jaynes-Cummings model is the observation of entanglement sudden death for every subsystem. The effects of various interactions such as Ising interaction, single photon exchange interaction and dipole-dipole interaction on entanglement dynamics are studied. The effects of detuning, Kerr-nonlinearity on the entanglement dynamics are investigated for every subsystem. It is noticed that proper choice of the interactions parameters, detuning and Kerr-nonlinearity effectively removes entanglement deaths from the dynamics.
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Mixed State Entanglement Via the Cauchy-Schwarz Inequality
A new sufficient entanglement condition based on Cauchy-Schwarz violations of the partial transpose is introduced and used to link thermal entanglement in the Jaynes-Cummings and quantum Rabi models to their symmetries.
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