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Telegram: https://t.me/lightcone_qm Support the channel: http://lightcone.ru/about/ The Stern and Gerlach experiment showed that the spin (its own magnetic moment) of an electron is quantized. Spin is the simplest quantum-mechanical system with only two states, a quantum analogue of a classical bit. One of the physical implementations of a qubit. VK group: https://vk.com/lightcone