In his notebook, quantum physicist Anton Zeilinger provides insight into a crucial phase of his scientific research. It features excerpts from his personal notebooks from March to June, 1993—a time in which he undertook early experiments with multiphoton states and entangled photons. The key terms for this emerging quantum-information technology were quantum computation, quantum communication, quantum cryptography, quantum cloning, and quantum teleportation. Zeilinger offers us a view of what is likely the first sketch of the teleportation scheme, notations of multiports and entanglements between two photons in higher-dimensional Hilbert spaces. For non-experts in this field, Zeilinger’s solid introduction, and his drawings, codes, and calculations, open a door to a world.  Anton Zeilinger (*1945) is Professor of Physics at the University of Vienna and Director of the Institute for Quantum Optics and Quantum Information at the Austrian Academy of Science; he is a member of the Honorary Advisory Committee of dOCUMENTA (13). Language: German/English