Continuous-variable entanglement distillation of non-Gaussian mixed states

被引：29

作者：

Dong, Ruifang ^{[1
,2
]}

Lassen, Mikael ^{[1
,2
]}

Heersink, Joel ^{[1
,3
]}

Marquardt, Christoph ^{[1
,3
]}

Filip, Radim ^{[4
]}

Leuchs, Gerd ^{[1
,3
]}

Andersen, Ulrik L. ^{[2
]}

机构：

[1] Max Planck Inst Sci Light, D-91058 Erlangen, Germany

[2] Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark

[3] Univ Erlangen Nurnberg, Inst Opt Informat & Photon, D-91058 Erlangen, Germany

[4] Palacky Univ, Dept Opt, CZ-77200 Olomouc, Czech Republic

来源：

PHYSICAL REVIEW A | 2010年 / 82卷 / 01期

关键词：

QUANTUM; PURIFICATION;

D O I：

10.1103/PhysRevA.82.012312

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Many different quantum-information communication protocols such as teleportation, dense coding, and entanglement-based quantum key distribution are based on the faithful transmission of entanglement between distant location in an optical network. The distribution of entanglement in such a network is, however, hampered by loss and noise that is inherent in all practical quantum channels. Thus, to enable faithful transmission one must resort to the protocol of entanglement distillation. In this paper we present a detailed theoretical analysis and an experimental realization of continuous variable entanglement distillation in a channel that is inflicted by different kinds of non-Gaussian noise. The continuous variable entangled states are generated by exploiting the third order nonlinearity in optical fibers, and the states are sent through a free-space laboratory channel in which the losses are altered to simulate a free-space atmospheric channel with varying losses. We use linear optical components, homodyne measurements, and classical communication to distill the entanglement, and we find that by using this method the entanglement can be probabilistically increased for some specific non-Gaussian noise channels.

引用

页数：14

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