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Embark on a fantastic journey into the world of the smallest particles and their use in secure encryption in this German-language conference talk. Explore quantum cryptography with Uli Kleemann, designed for non-physicists and mathematicians, featuring video sequences. Delve into topics such as Bell's inequality, quantum bits, the nature of randomness, the double-slit experiment, and the fundamentals of quantum cryptography. Discover how quantum computers function, the possibility of teleportation, and their impact on encryption. Examine concepts like Schrödinger's cat, entanglement, and "spooky action at a distance." Learn about the Shor algorithm, quantum Fourier transformation, the BB84 protocol for quantum key exchange, and the no-cloning theorem. Conclude with a look at post-quantum cryptography and engage in a Q&A session.