Spatially distributed multipartite entanglement enables EPR steering of atomic clouds

被引：154

作者：

Kunkel, Philipp ^{[1
]}

Pruefer, Maximilian ^{[1
]}

Strobel, Helmut ^{[1
]}

Linnemann, Daniel ^{[1
]}

Froelian, Anika ^{[1
]}

Gasenzer, Thomas ^{[1
]}

Gaerttner, Martin ^{[1
]}

Oberthaler, Markus K. ^{[1
]}

机构：

[1] Heidelberg Univ, Kirchhoff Inst Phys, Neuenheimer Feld 227, D-69120 Heidelberg, Germany

来源：

SCIENCE | 2018年 / 360卷 / 6387期

基金：

欧洲研究理事会;

关键词：

PODOLSKY-ROSEN PARADOX; CONTINUOUS-VARIABLES; OPTICAL LATTICES; QUANTUM; SYSTEMS;

D O I：

10.1126/science.aao2254

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A key resource for distributed quantum-enhanced protocols is entanglement between spatially separated modes. However, the robust generation and detection of entanglement between spatially separated regions of an ultracold atomic system remain a challenge. We used spin mixing in a tightly confined Bose-Einstein condensate to generate an entangled state of indistinguishable particles in a single spatial mode. We show experimentally that this entanglement can be spatially distributed by self-similar expansion of the atomic cloud. We used spatially resolved spin read-out to reveal a particularly strong form of quantum correlations known as Einstein-Podolsky-Rosen (EPR) steering between distinct parts of the expanded cloud. Based on the strength of EPR steering, we constructed a witness, which confirmed genuine 5-partite entanglement.

引用

页码：413 / 415

页数：3

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