Observation of Four-Photon Orbital Angular Momentum Entanglement

被引：87

作者：

Hiesmayr, B. C. ^{[1
]}

de Dood, M. J. A. ^{[2
]}

Loffler, W. ^{[2
]}

机构：

[1] Univ Vienna, Fac Phys, Boltzmanngasse 5, A-1090 Vienna, Austria

[2] Leiden Univ, Huygens Kamerlingh Onnes Lab, POB 9504, NL-2300 RA Leiden, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 07期

基金：

奥地利科学基金会;

关键词：

QUANTUM; LIGHT; DISLOCATIONS; STATES; BEAMS;

D O I：

10.1103/PhysRevLett.116.073601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate genuine multipartite quantum entanglement of four photons in their orbital angular momentum degrees of freedom, where a high-dimensional discrete Hilbert space is attached to each photon. This can encode more quantum information compared to the qubit case, but it is a long-standing problem to entangle more than two such photons. In our experiment we use pulsed spontaneous parametric down-conversion to produce the photon quadruplets, which allows us to detect about one four-photon event per second. By means of quantum state reconstruction and a suitable witness operator we find that the photon quadruplets form a genuine multipartite entangled symmetric Dicke state. This opens a new tool for addressing foundational questions in quantum mechanics, and for exploration of novel high-dimensional multiparty quantum information applications such as secret sharing.

引用

页数：5

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