RAS question
In quantum computing, the basic unit of information is called a:
Correct answer: (B) Qubit.
In quantum computing, the basic unit of information is a qubit, or quantum bit.
Explanation
A qubit, short for quantum bit, is the basic unit of quantum information. The NIST-hosted thesis explains quantum information in terms of qubits and contrasts them with classical bits: a classical bit has a discrete value, while a qubit can exist in a superposition state such as a combination of 0 and 1. That is why the MCQ does not ask for byte, bit, or pixel. Byte and bit belong to ordinary digital computing, where information is represented through fixed classical states. Quantum computing uses qubits because its information unit is defined by quantum state behaviour, especially superposition.
Why the other options are wrong
- (A) A byte is an eight-bit unit in classical computing, so it is not the basic unit of quantum information.
- (C) A pixel is a display-resolution unit, not an information unit used to define either classical or quantum computing.
- (D) A bit is the basic classical information unit with a 0 or 1 value, whereas quantum computing uses qubits that can be in superposition.
Concept
This tests the Science and Technology concept of basic quantum-computing terminology, especially the distinction between classical and quantum information units. It recurs in RAS-style questions because emerging technology topics often begin with precise definitions.