Photon Entanglement and Quantum Communication and Teleportation
Prof. Dr. Anton Zeilinger (Institut für Quantenoptik, Universität Wien)

In 1935, Albert Einstein, Boris Podolsky and Nathan Rosen (EPR) showed that entangled quantum states provide nonlocal correlations. John Bell in 1964 demonstrated that predictions of quantum mechanics for entangled states are in conflict with the local realistic EPR viewpoint.

In the talk, I will present recent results with entangled photons. Long-distance quantum entanglement provides new ways of communication, including quantum teleportation and quantum cryptography. These form the backbone of a future quantum internet. Also, orbital angular momentum (OAM) states of photons have been shown to exhibit entanglement for quantum numbers above 1.000 and of quantum superpositions in more than 100-dimensional Hilbert spaces. This sheds new light on the quantum-classical transition. It also opens up quantum information tasks with high alphabets.