Q. Which one of the following is the fundamental difference between a classical bit and a quantum bit (qubit)?

[A] Bits can represent multiple states simultaneously, whereas qubits can only represent one state at a time.

[B] Bits can represent one of two states (0 or 1), whereas qubits can represent both 0 and 1 simultaneously.

[C] Bits are based on quantum mechanics, whereas qubits are based on classical mechanics.

[D] Bits use superposition and entanglement, while qubits do not.

Answer: B
Notes:

Explanation – Classical bits can only exist in one of two states, either 0 or 1, at any given time. Quantum bits (qubits), due to the principle of quantum superposition, can exist in a combination of both 0 and 1 states simultaneously. This gives quantum computers their potential for having exponentially greater computational power compared to classical computers.

Source: The Hindu

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