Quantum Entanglement of Complex Photon Polarization Patterns in Vector Beams

We report the efficient creation and detection of hybrid entanglement between one photon's polarization and another photon's complex transverse polarization pattern. The polarization measurement of the first photon triggers a polarization sensitive imaging of its partner photon, the vector photon, using a single-photon sensitive camera. Thereby, we reconstruct tomographically the vector photon's complex polarization patterns dependent on the type of polarization measurement performed on its partner. We visualize the varying strengths of polarization entanglement for different transverse regions and demonstrate a novel feature: each vector photon can be both entangled and not entangled in polarization with its partner photon. We give an intuitive, information theoretical explanation for our results.