It is and isn’t

“A state such as ∣ψ) is often referred as a qubit and corresponds to a unit of quantum information (in contrast to the bit, which is the unit of classical information). Clearly, bits and qubits are radically different. Bits can assume the value of 0 or 1, but once fixed, its value is unique, deterministic, and unambiguous. On the other hand, qubits can simultaneously take the value of 0 and 1 in a probabilistic mixture of complex amplitudes, and as a consequence, its value is not deterministic.” – Marco Lanzagorta, et al., “Quantum Sensing in the Maritime Environment”


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