Observation of Four-Photon Orbital Angular Momentum Entanglement

Autor(en)

B. C. Hiesmayr, M. J. A. de Dood, W. Loffler

Abstrakt

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.

Organisation(en)

Teilchenphysik, Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Leiden University

Journal

Physical Review Letters

Band

116

Anzahl der Seiten

5

ISSN

0031-9007

DOI

https://doi.org/10.1103/PhysRevLett.116.073601

Publikationsdatum

02-2016

Peer-reviewed

Ja

ÖFOS 2012

103024 Quantenfeldtheorie, 103026 Quantenoptik, 103034 Teilchenphysik

Schlagwörter

ASJC Scopus Sachgebiete

Physics and Astronomy(all)

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/observation-of-fourphoton-orbital-angular-momentum-entanglement(2e01712d-bbb3-4090-bb35-359592842c30).html