Dynamical control of population and entanglement for open Λ-type atoms by engineering the environment

Abstract

The exactly analytical solution for the dynamics of the dissipative Λ-type atom in the zero-temperature Lorentzian environment is presented. On this basis, we study the evolution of the population and entanglement. We find that the stable populations on the two lower levels of the Λ-type atom can be effectively adjusted by the combination of the relative decay rate and the environmental spectral frequency. However, for the initial Werner-like state, the stable entanglement between the two Λ-type atoms has very little tunability. Furthermore, the stable entanglement for the bilateral environment case is larger than that of the unilateral environmental case. A nonintuitive relation between the stable entanglement and stable population is found.

Qubit movement-assisted entanglement swapping

“…For instance, it has been shown that there exists a long-living entangled state due to the interaction of a two-qubit system with a common environment. [43][44][45][46][47] This idea has been generalized to an arbitrary number of qubits inside an environment. [48][49][50] Moreover, quantum reservoir engineering has been proven to be useful in stabilizing open quantum systems [51] and remote entanglement and concentration, [52] etc.…”