+Z / |0⟩
−Z / |1⟩
+X / |+⟩
+Y / |i⟩
|0⟩
State Vector
|ψ⟩ = α|0⟩ + β|1⟩
Angles
θ = 0.00 rad
φ = 0.00 rad
Amplitudes
α = 1.00 + 0.00i
β = 0.00 + 0.00i
Probabilities
P(|0⟩) = 100%
P(|1⟩) = 0%
What is a qubit?

A qubit is the basic unit of quantum information. Unlike a classical bit (always 0 or 1), a qubit can exist in a superposition — a combination of both states simultaneously. The Bloch sphere is a geometric representation of all possible single-qubit states. The north pole is |0⟩, the south pole is |1⟩, and points on the equator represent equal superpositions.