Control and Transfer of Entanglement between Two Atoms Driven by Classical Fields under Dressed-State Representation

Abstract

We have studied the dynamics and transfer of the entanglement of the two identical atoms simultaneously interacting with vacuum field by employing the dressed-state representation. The two atoms are driven by classical fields. The influence of the initial entanglement degree of two atoms, the coupling strength between the atom and the classical field and the detuning between the atomic transition frequency and the frequency of classical field on the entanglement and atomic linear entropy is discussed. The initial entanglement of the two atoms can be transferred into the entanglement between the atom and cavity field when the dissipation is neglected. The maximally entangled state between the atoms and cavity field can be obtained under some certain conditions. The time of disentanglement of two atoms can be controlled and manipulated by adjusting the detuning and classical driving fields. Moreover, the larger the cavity decay rate is, the more quickly the entanglement of the two atoms decays.

The entropic uncertainty preservation in non-Markovian environment via classical driving fields

“…Numerous efforts have been made to achieve this purpose, such as employing the quantum Zeno effect [22,23], utilizing weak measurement and quantum measurement reversal protocols [24,25], and adding auxiliary subsystems into the reservoir [26][27][28], among others. However, it can be demonstrated how the implementation of a classical driving field can suppress the negative influences of the loss of quantum entanglement [29][30][31][32]. The effects of the environment on the EULB in the presence of weak measurement and measurement reversal have been studied in [33].…”

Entanglement dynamics of an open moving-biparticle system driven by classical-field

“…How to maintain entanglement of open quantum systems for a long time is an important challenge in quantum information processing tasks. In past years, some quantum control methods have been proposed in order to effectively protect quantum entanglement of open systems, such as the quantum Zeno effect [14,37,38], weak measurement [39][40][41], classical field driving [42][43][44], PT-symmetric operation [45] and external magnetic field and Dzyaloshinskii-Moriya interaction [46]. On the other hand, based on the fact that atoms cannot be cooled to a complete standstill in the current cavity QED experiments [47][48][49], the interaction of moving qubits with electromagnetic radiation [50,51] and quantum effects of moving-qubit systems [30,50,51] have been attracting more and more attention in recent years.…”

Classical-driving-assisted coherence dynamics and its conservation

“…[28] Besides, the atomic system is driven by non-resonant external periodic (laser) fields, [29,30] and applying the external classical driving field to the atom can preserve entanglement and improve the robustness of entanglement. [31][32][33][34] So in the atom-cavity evolution process, the relationship between the quantum coherence and the quantum entanglement by considering a classical field to drive the atom, should be studied both physically and methodologically.…”