Glossary

Quantum computing glossary in plain language.

Tiny definitions with links back to the quantum circuit simulator, lessons, and quantum algorithms.

Use this while experimenting

When a term feels slippery, open the linked lesson and run the smallest matching circuit.

Amplitude

A signed or complex ingredient that becomes probability when squared.

Learn amplitudes

CNOT

A two-qubit gate that flips a target when the control is 1.

Learn gates

Entanglement

A shared state where outcomes are correlated beyond independent randomness.

Learn entanglement

Gate

An operation that changes a quantum state.

Learn gates

Measurement

The action that turns quantum probabilities into a classical result.

Learn measurement

Phase

Hidden direction in an amplitude that matters when paths meet later.

Learn phase

Qubit

A two-outcome quantum system described by amplitudes before measurement.

Learn qubits

Superposition

A state with more than one possible measurement outcome before observation.

Learn superposition