A quantum bit, or qubit, is the fundamental unit of quantum information, analogous to a classical bit in traditional computing. Unlike a classical bit that can be either 0 or 1, a qubit can exist in a superposition of states, meaning it can be both 0 and 1 simultaneously until measured. This unique property enables qubits to perform complex calculations more efficiently than classical bits, which is essential for the advancements in quantum computing and information processing.
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