PT Journal
AU Dada, AC
   Leach, J
   Buller, GS
   Padgett, MJ
   Andersson, E
TI Experimental high-dimensional two-photon entanglement and violations of generalized Bell inequalities
SO Nature Physics
JI Nat. Phys.
PY 2011
BP 677
EP 680
VL 7
IS 9
DE fromIPMRAS
AB Quantum entanglement plays a vital role in many quantum-information and communication tasks. Entangled states of higher-dimensional systems are of great interest owing to the extended possibilities they provide. For example, they enable the realization of new types of quantum information scheme that can offer higher-information-density coding and greater resilience to errors than can be achieved with entangled two-dimensional systems (see ref. and references therein). Closing the detection loophole in Bell test experiments is also more experimentally feasible when higher-dimensional entangled systems are used. We have measured previously untested correlations between two photons to experimentally demonstrate high-dimensional entangled states. We obtain violations of Bell-type inequalities generalized to d-dimensional systems up to d=12. Furthermore, the violations are strong enough to indicate genuine 11-dimensional entanglement. Our experiments use photons entangled in orbital angular momentum, generated through spontaneous parametric down-conversion, and manipulated using computer-controlled holograms.
ER