Angular Two-Photon Interference and Angular Two-Qubit States
Anand K. Jha, Jonathan Leach, Barry Jack, Sonja Franke‐Arnold, Stephen Mark Barnett, Robert W. Boyd, Miles J. Padgett · Physical Review Letters · 2010
Using angular-position-orbital-angular-momentum entangled photons, we study angular two-photon interference in a scheme in which entangled photons are made to pass through apertures in the form of double angular slits, and using this scheme, we demonstrate an entangled two-qubit state that is based on the angular-position correlations of entangled photons. The entanglement of the two-qubit state is quantified in terms of concurrence. These results provide an additional means for preparing entangled quantum states for use in quantum information protocols.