First proof of genuine multipartite entanglement for four photons

20.06.2017

For the first time scientists have entangled four photons in their orbital angular momentum by sending a laser through a crystal.

Via carefully designed entanglement witnesses it become for the first time possible to observe genuine multipartite entanglement in a system of four photons. The photons were angled in their orbital angular momentum. This was a joint work between Vienna (theory) and Leiden (experiment).

A synopsis written by the PRL-editor can be found at physics.aps.org/synopsis-for/10.1103/PhysRevLett.116.073601

More information: Observation of four-photon orbital angular momentum entanglement, B. C. Hiesmayr, M, J. A. de Dood, W. Löffler, Physical Review Letters, 2016. On Arxiv: arxiv.org/abs/1508.01480

Read more at: https://phys.org/news/2016-02-leiden-physicists-entangle-rotating-photons.html#jCp

More information: Observation of four-photon orbital angular momentum entanglement, B. C. Hiesmayr, M, J. A. de Dood, W. Löffler, Physical Review Letters, 2016. On Arxiv: arxiv.org/abs/1508.01480

Read more at: https://phys.org/news/2016-02-leiden-physicists-entangle-rotating-photons.html#jCp

More information: Observation of four-photon orbital angular momentum entanglement, B. C. Hiesmayr, M, J. A. de Dood, W. Löffler, Physical Review Letters, 2016. On Arxiv: arxiv.org/abs/1508.01480

Read more at: https://phys.org/news/2016-02-leiden-physicists-entangle-rotating-photons.html#jCp

Publication: Observation of four-photon orbital angular momentum entanglement, B. C. Hiesmayr, M, J. A. de Dood, W. Löffler, Physical Review Letters, 2016. On Arxiv: arxiv.org/abs/1508.01480

Leiden physicists sent short ultraviolet laserpulses of two picoseconds through a crystal. This leads to the creation of four photons that are entangled in their orbital angular momentum—here depicted as red blue spirals. The rainbow colored circles illustrate the phase (color) and intensity (brightness) of the photon’s cross section. Credit: Leiden Institute of Physics