Displacement-enhanced entanglement distillation of single-mode-squeezed entangled states

TL;DR

This paper presents a simplified protocol for entanglement distillation of single-mode-squeezed entangled states, which outperforms previous methods especially at low initial entanglement and is effective on decohered states.

Contribution

It introduces a displacement-enhanced scheme for entanglement distillation of asymmetric Gaussian states, improving efficiency and practicality over prior protocols.

Findings

More entanglement generated at low initial entanglement levels.

Effective on decohered entangled states.

Works with practical photon subtraction setups.

Abstract

It has been shown that entanglement distillation of Gaussian entangled states by means of local photon subtraction can be improved by local Gaussian transformations. Here we show that a similar effect can be expected for the distillation of an asymmetric Gaussian entangled state that is produced by a single squeezed beam. We show that for low initial entanglement, our largely simplified protocol generates more entanglement than previous proposed protocols. Furthermore, we show that the distillation scheme also works efficiently on decohered entangled states as well as with a practical photon subtraction setup.