Entanglement distillation from Gaussian input states by coherent photon addition

TL;DR

This paper introduces a novel coherent photon addition scheme that enhances entanglement in Gaussian states, offering a new non-Gaussian operation method with potential applications in quantum information processing.

Contribution

The paper proposes a new coherent photon addition scheme to increase entanglement in Gaussian states, expanding the toolkit for non-Gaussian quantum operations.

Findings

The scheme successfully increases entanglement in Gaussian states.

It provides a new approach for entanglement distillation.

It enables study of decoherence effects in non-Gaussian operations.

Abstract

The entanglement between Gaussian entangled states can be increased by non-Gaussian operations. We design a new scheme named coherent photon addition, which can coherently add one photon generated by spontaneous parametric down conversation process to Gaussian quadrature-entangled light pulses created by a non-degenerate optical parametric amplifier. This operation can increase the entanglement of input two-mode Gaussian states as an entanglement distillation, and provides us a new method of non-Gaussian operation. This scheme can also help us to study the decoherence of adding one to two-mode Gaussian states from coherent photon addition to normal photon addition.