How could a quantum computer actually physically work ?

How could a quantum computer actually physically work ?
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Quantum computing is the concept of applying the rules of quantum physics on computing. Meaning, as far as I’ve learned, it’s an attempt to expand the number of bits that a computer can understand to include more than just 1 and 0. And as far as I’ve understood, if something like that ever sees the light, probably all the current rules of Digital Logic will become obsolete.
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