A Humboldt fellow and his international physcist colleagues have deciphered a mathematical connection between quantum phenomena: Superposition and entanglement also exist beyond quantum theory.
In the world of the very smallest particles – the so-called quanta – there are extraordinary phenomena that completely contradict our everyday experience and are difficult for laypeople to comprehend. For example, quantum systems can be in several “states” at the same time – certain measured values only appear when a measurement is actually carried out. Physically, this is called “superposition”. Another typical quantum phenomenon is entanglement: two particles are connected in a special way, no matter how far apart they are. As crazy as such phenomena may seem, they are the basis for groundbreaking innovations such as quantum computers or the secure exchange of information known as quantum cryptography.
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