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3D Bloch Sphere: Qubit Superposition & Decoherence

Interactive 3D Bloch-sphere simulator: watch a qubit's state vector precess around the pole while environment coupling spirals it inward from the surface toward the axis — decoherence turning coherent superposition into a classical mixture — then measure to collapse it to a pole.

Quantum Physics3DEasy60 FPS📱 Mobile-adapted⇄ 2D version

The Bloch sphere turns a qubit's two complex amplitudes into a single point in 3D space, and this simulator lets you watch that point move in real time. A coherent superposition precesses around the pole at the Larmor rate set by the qubit's energy splitting; couple it to a simulated environment and the trajectory spirals inward from the surface, its trail fading behind it, as decoherence strips away the relative phase between |0⟩ and |1⟩ while leaving their populations untouched. Press Measure at any point to sample the Born-rule outcome and watch the vector snap to a pole, or orbit the camera to inspect the spiral from any angle.

⚙ Under the hood

Visualize a qubit's state as it spirals on a Bloch sphere toward one of its poles, with coherence decaying and leaving a fading trail behind.

Quantum MechanicsSuperpositionDecoherenceBloch Sphere

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install