Effects of noise on entanglement dynamics in atom-field interactions

Abstract

The entanglement dynamics in a system of the interaction of an atom with a single-mode cavity field in the presence of noise is studied by the Jaynes-Cummings model. Random phase telegraph noise is considered as the noise in the interaction and an exact solution to the model under this noise is obtained. The obtained solution is used to investigate the entanglement dynamics of the atom-field interaction. The mutual entropy is adopted for the quantification of the entanglement in the interaction. It is found that the entanglement is a non monotonic function of the intensity of the noise. The degree of the entanglement decreases to a minimum value for an optimal intensity of the noise and then increases for a sufficiently large intensity.

Stationary state entanglement of a one-atom two-field system under random phase telegraph noise

“…However, the field-field entanglement here is stronger than the atom-atom entanglement. These are in contrast to the results in our previous works [21,22] in which we investigated the entanglement dynamics in the one-atom one-field system under RPTN. The previous results show that there is a non-monotonic relation between the strength of the noise and the mean dwell time as again revealed by the computation of the concurrence.…”

Entanglement of two superconducting charge qubits with the Glauber–Lachs state

“…The JCM with the random telegraph noise was modeled by Joshi and co-workers [27,28], who proposed, in contrast to Milburn's model [29], a type of intrinsic decoherence that preserves the total energy of the system (a closed system). We used this model and observed these: the entanglement dynamics of the JCM for the single qubit-field system [23,24] is a non-monotonic function and for the two qubits-field system [25] is a monotonic function of the intensity of the noise. In the case of the qubit(s)-field interaction with the Glauber-Lachs state in [12] and in the present paper, we have the same results; the entanglement is for the former a non-monotonic function and for the latter a monotonic function of the thermal photons.…”