two-state (or two-level) quantum-mechanical system

A qubit is a two-state (or two-level) quantum-mechanical system, one of the simplest quantum systems displaying the peculiarity of quantum mechanics.

units of quantum information

Qubits are units of quantum information that are integral to quantum computing because they exist in a superposition of two states and can hold a much larger amount of information compared to a regular bit used in normal computers.

quantum bits

These subatomic particles represent information as elements, which are then called quantum bits (or qubits).

quantum bit

Quantum information science uses the quantum bit, or qubit, which may exist in a quantum superposition that includes values of zero and one simultaneously.

a unit of information that can be in a superposition of two states

A qubit (or quantum bit) is a unit of information that can be in a superposition of two states, denoted as and .

a quantum version of a computer bit, which is the smallest unit of data in a computer

A qubit, in simplest terms, is a quantum version of a computer bit, which is the smallest unit of data in a computer.

a basic unit of quantum information that can take on richer states that extend beyond just 0 and 1

In quantum computing, a qubit is a basic unit of quantum information that can take on richer states that extend beyond just 0 and 1.

a quantum system

A qubit is a quantum system, and this world has two possible states, kind of like a classic computer bit can be a 0 or a 1.

a two-state quantum-mechanical system, such as the polarization of a single photon

A qubit is a two-state quantum-mechanical system, such as the polarization of a single photon: here the two states are vertical polarization and horizontal polarization.

Superconducting quantum bits

Superconducting quantum bits (simply, qubits) are artificial atoms that use various methods to produce bits of quantum information, the fundamental component of quantum computers.

one of the smallest units of a quantum computing system

A qubit is one of the smallest units of a quantum computing system.

coherent superpositions of the two possible states

These coherent superpositions of the two possible states are called qubits and are the basic ingredient of Quantum information science.

a generalization of a bit - a system with two possible states

A qubit is a generalization of a bit - a system with two possible states, that can be in a quantum superposition of both.

the smallest circuit used in a quantum system, such as a quantum computer — the more qubits, the more complex processing potential of a computer

A qubit is the smallest circuit used in a quantum system, such as a quantum computer — the more qubits, the more complex processing potential of a computer.

an idealization that could be used to build quantum computers

A qubit is an idealization that could be used to build quantum computers, if such a thing exists and can be scaled up.

a two-state quantum-mechanical system typically represented with a Bloch sphere

A qubit is a two-state quantum-mechanical system typically represented with a Bloch sphere.

a short form for a quantum bit, which is the fundamental unit of quantum information

For those unaware, a qubit is a short form for a quantum bit, which is the fundamental unit of quantum information.

a system which can be asked many, many different questions

In contrast, a qubit is a system which can be asked many, many different questions, but to each question, only one of two answers can be given.

the smallest circuit - used in a quantum system, such as a quantum computer

A qubit is the smallest circuit used in a quantum system, such as a quantum computer -; the more qubits, the more complex processing potential of a computer.

an isolated system

A qubit is an isolated system---a sort of toggle---which is maintained simultaneously in a mixture of two quantum states.