quantum bit

noun

, Computers.

1. the fundamental unit of information in a quantum computer, capable of existing in two states, 0 or 1, simultaneously or at a different time.

quantum bit

1. The smallest unit of information in a quantum computer. Unlike bits in classical systems, which are in one of two possible states labelled 1 and 0, a quantum bit exists in a superposition of these two states, settling on one or the other only when a measurement of the state is made.
2. Also called qubit

Word History and Origins

Origin of quantum bit¹

First recorded in 1990–95

Example Sentences

Instead of the traditional bits made of 1s and 0s, they use quantum bits that can represent different values at the same time.

From MIT Technology Review

The fragile quantum bits, or qubits, that make up the machines are notoriously error-prone, but now scientists have shown that they can fix the flubs.

From Science News

Existing quantum computers are notoriously fragile, their quantum bits — qubits — prone to incurring random errors.

From Quanta Magazine

Google’s device, called Sycamore, is based on tiny quantum bits made of superconducting materials, which conduct energy without resistance.

From Science News

Qubits are “quantum bits,” a turbocharged version of classical computing’s bits.

From Fortune