Enhancement of multipartite entanglement in an open system under non-inertial frames

Abstract

In this paper, multipartite entanglement enhancement in an open system under non-inertial frames via local non-unitary operations is explored. Explicitly, we investigate an available methodology to enhance tripartite entanglement of X-state, when the systems suffer from amplitude damping (AD) noise and one subsystem is under non-inertial frames. As an illustration, we consider three cases (one subsystem or multi-subsystem suffers from decoherence) by using local non-unitary operations, and the corresponding entanglement behaviors are revealed. It turns out that the local non-unitary operation can enhance entanglement to some degree. The Unruh effect and decoherence will influence the tripartite entanglement. However, the impact of Unruh effect on tripartite entanglement is weaker than that of decoherence. In addition, we obtain an interesting result: One can estimate and probe the decoherence strength (AD noise) in accordance with the change of local non-unitary operation strength and genuinely multipartite entanglement variation. Therefore, our work may be beneficial to explore the dynamic behavior of tripartite entanglement in open systems under relativity frame.