Hyperentanglement of two photons in three degrees of freedom
- 9 March 2009
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 79 (3), 030301
- https://doi.org/10.1103/physreva.79.030301
Abstract
A six-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 two-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 witness criterion specifically presented for hyperentangled states. The experiment represents a realization of a genuine hyperentangled state with the maximum entanglement between the two particles allowed in the given Hilbert space.
Keywords
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