Quantum superposition is one of the most counter-intuitive yet fundamental principles of physics.
In classical computing, a bit is strictly a 0 or a 1.
In quantum computing, a qubit exists in a linear combination of states:
$$|psirangle = alpha |0rangle + beta |1rangle$$
where $|alpha|^2 + |beta|^2 = 1$.
Superposition allows quantum algorithms to process exponentially large state spaces simultaneously. When combined with quantum entanglement and interference, algorithms like Shor’s and Grover’s can achieve dramatic computational speedups over classical algorithms.
However, the moment a measurement occurs, the wave function collapses into a single classical state (0 or 1) with probabilities determined by $|alpha|^2$ and $|beta|^2$.
Managing decoherence and maintaining state stability remain the primary engineering hurdles in building scalable quantum hardware.
