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Question

The unit of information used in quantum computers is called :

This question was previously asked in
UPSSSC Lower PCS 2026 Question Paper (23-Aug-2026)
The correct answer is

Qubits

The unit of information in a quantum computer is the qubit, short for quantum bit.

A classical bit is definitely either 0 or 1. A qubit is a two-level quantum system that can occupy a superposition of both basis states at once, and several qubits can be entangled so that their states are correlated in ways no set of classical bits can reproduce. This is what allows \(n\) qubits to represent \(2^n\) amplitudes simultaneously and gives quantum algorithms their advantage.

The other terms are all classical measures. A bit is the basic classical unit, a nibble is a group of four bits, and a byte is a group of eight bits. None of them carries superposition or entanglement.

Hence, the answer is Qubits.

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