Defeating entanglement sudden death by a single local filtering

TL;DR

This paper demonstrates that a single local operation can partially recover genuine multipartite entanglement lost due to local decoherence, specifically for pure W and cluster states under generalized amplitude damping.

Contribution

It shows that entanglement can be retrieved by redistributing remaining entanglement using a single local filtering operation for certain initial states.

Findings

Entanglement can be partially recovered after decoherence.

Recovery depends on initial state type and decoherence model.

Single local filtering redistributes entanglement to mitigate loss.

Abstract

Genuine multipartite entanglement of a quantum system can be partially destroyed by local decoherence. Is it possible to retrieve the entanglement to some extent by a single local operation? The answer to this question depends very much on the type of initial genuine entanglement. For initially pure W and cluster states and if the decoherence is given by generalized amplitude damping, the answer is shown to be positive. In this case, the entanglement retrieving is achieved just by redistributing the remained entanglement of the system.