Collapse–revival of quantum discord and entanglement

• The correlations dynamics of two atoms in the case of a micromaser-type system is investigated.
• A quasi-periodic collapse and revival phenomenon for quantum discord and entanglement is reported.
• A phenomenon of correlations revivals different from that of non-Markovian dynamics is revealed.
• The oscillations of time evolution of both quantum discord and entanglement are almost in phase in our system.
• Quantum discord and entanglement have similar evolution behavior in some time range.

In this paper the correlations dynamics of two atoms in the case of a micromaser-type system is investigated. Our results predict certain quasi-periodic collapse and revival phenomena for quantum discord and entanglement when the field is in Fock state and the two atoms are initially in maximally mixed state, which is a special separable state. Our calculations also show that the oscillations of the time evolution of both quantum discord and entanglement are almost in phase and they both have similar evolution behavior in some time range. The fact reveals the consistency of quantum discord and entanglement in some dynamical aspects.