Observation of Four-Photon Orbital Angular Momentum Entanglement
- Author(s)
- B. C. Hiesmayr, M. J. A. de Dood, W. Loffler
- Abstract
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(s)
- Particle Physics, Quantum Optics, Quantum Nanophysics and Quantum Information
- External organisation(s)
- Leiden University
- Journal
- Physical Review Letters
- Volume
- 116
- No. of pages
- 5
- ISSN
- 0031-9007
- DOI
- https://doi.org/10.1103/PhysRevLett.116.073601
- Publication date
- 02-2016
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103024 Quantum field theory, 103026 Quantum optics, 103034 Particle physics
- Keywords
- ASJC Scopus subject areas
- Physics and Astronomy(all)
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/observation-of-fourphoton-orbital-angular-momentum-entanglement(2e01712d-bbb3-4090-bb35-359592842c30).html