Hyperentanglement of two photons in three degrees of freedom

Details Hyperentanglement of two photons in three degrees of freedom Hyperentanglement of two photons in three degrees of freedom

2008-10-24

arxiv.org/abs/0810.4461v1

Phys. Rev. A 79, 030301(R) (2009)

Physics

Quantum Physics

4 pages, 2 figures, Revtex4

Scientific paper

10.1103/PhysRevA.79.030301

A 6-qubit hyperentangled state has been realized by entangling two photons in three degrees of freedom. These correspond to the polarization, the longitudinal momentum and the indistinguishable emission produced by a 2-crystal system operating with Type I phase matching in the spontaneous parametric down conversion regime. The state has been characterized by a chained interferometric apparatus and its complete entangled nature has been tested by a novel witness criterium specifically introduced for hyperentangled states. The experiment represents the first realization of a genuine hyperentangled state with the maximum entanglement between the two particles allowed in the given Hilbert space.

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