  We show that the quantum disentanglement eraser implemented on a two-photon
system from parametric down-conversion is a general method to create hybrid
photonic entanglement, namely the entanglement between different degrees of
freedom of the photon pair. To demonstrate this, we generate and characterize a
source with tunable degree of hybrid entanglement between two qubits, one
encoded in the transverse momentum and position of a photon, and the other in
the polarization of its partner. In addition, we show that a simple extension
of our setup enables the generation of two-photon qubit-qudit hybrid entangled
states. Finally, we discuss the advantages that this type of entanglement can
bring for an optical quantum network.
