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 23 × 23 Hilbert space. © 2009 The American Physical Society.
Hyperentanglement of two photons in three degrees of freedom / Vallone, Giuseppe; Raino, Ceccarelli; DE MARTINI, Francesco; Mataloni, Paolo. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 79:3(2009), pp. 030301-1-030301-4. [10.1103/physreva.79.030301]
Hyperentanglement of two photons in three degrees of freedom
VALLONE, GIUSEPPE;DE MARTINI, Francesco;MATALONI, Paolo
2009
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 23 × 23 Hilbert space. © 2009 The American Physical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
