Continuous-variable-entanglement distillation with photon addition

Shengli Zhang*, Yuli Dong, Xubo Zou, Baosen Shi, Guangcan Guo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Photon subtraction (PS), due to its feasibility in physical implementation, has been widely utilized in Gaussian entanglement distillation. However, in this paper, we will show that photon addition (PA) can be employed to provide an additional enhancement in both the quality of distilled entanglement and the success probability if the input state is a weak two-mode squeezed vacuum state. Moreover, compared with biside PS, the distillation probability gains a O(1λ2) improvement, which increases rapidly when λ1. Our PA-based scheme is obtained first by single-photon injection and later by vacuum state projection. The performance of PA in the presence of both an approximated single photon and amplitude-damping noise has been analyzed. Our result sheds more light on the indispensable non-Gaussian ingredients in Gaussian-state distillation and could be of great use in developing more efficient distillation schemes. Finally, the sensitivity of the PA scheme to inefficient photon detection has also been investigated.

Original languageEnglish
Article number032324
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume88
Issue number3
DOIs
Publication statusPublished - 27 Sept 2013
Externally publishedYes

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