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