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Neckties and Quantum Particles

October 18 - International Necktie Day!

18. Oktober ist internationaler Tag der Krawatte

18. Oktober ist internationaler Tag der Krawatte

18. Oktober ist internationaler Tag der Krawatte

18. Oktober ist internationaler Tag der Krawatte

If we turn around, our conversation partner faces our back, only after a full rotation, the original state is restored. With quantum particles, this is different: Sometimes they have to be rotated twice to make sure that they end up in their original state. That may sound strange – but Gerald Badurek, Dean of Physics, explains it with a necktie and tells us what this has to do with quantum computing:

(German, English and Japanese captions are available!)