Experimental high-dimensional multipartite entanglement with twisted photons

Experimental high-dimensional multipartite entanglement with twisted photons

Seminar author:Mehul Malik

Event date and time:07/23/2015 02:30:pm

Event location:IFAE seminar room

Event contact:Marcus Huber

Initially proposed as a two-particle problem, the concept of entanglement was extended to three particles by Greenberger, Horne, and Zeilinger in 1989. To date, experimental realizations of multipartite states have been limited to two dimensions due to the use of polarization-entangled photons. When the dimensionality of such states is increased, a richer entanglement structure emerges, where the dimensionality of each component particle can be different. The orbital angular momentum (OAM) of photons offers a discrete, high-dimensional Hilbert space for realizing such states. We describe the experimental generation of a high-dimensional, three-particle entangled state using the OAM degree of freedom. Through the use of an appropriate entanglement witness, we verify that our state has an entangled dimensionality structure of 3x3x2 dimensions.