What fundamental capability distinguishes a quantum bit (qubit) from a classical bit?

💡 Explanation:

A classical bit can only be in one state (0 or 1) at any given time. A quantum bit, or qubit, can leverage the quantum mechanical principle of superposition to exist as a weighted combination of 0 and 1 simultaneously until it is measured. This capability allows quantum computers to perform computations on multiple states concurrently, leading to potential exponential speedups for certain problems.