🧪 The Quantum Lab

Drag the slider to zoom from your size down to an atomic nucleus. Each step shrinks the view 10 times.

Change the temperature. The glowing curve is what nature really does (Planck's law). The dashed line is the old prediction that shoots off to infinity.

Pick a colour and a brightness. Below the metal's threshold, nothing happens. Above it, each photon frees one electron — brighter light frees more, bluer light makes them faster.

Fire electrons one by one and watch the pattern build. Then switch on the “which-slit detector” — peeking destroys the stripes.

Click “Excite” to kick the electron up, then watch it fall. Each fall emits a photon — its colour depends on which rungs it jumps between. The spectrum strip collects the lines.

Squeeze the wave packet to pin down its position. Watch the momentum spread grow on the right. Their product never drops below the limit.

A “particle in a box”: like a guitar string, only whole-number wave patterns fit. Switch between ψ (the wave) and |ψ|² (the probability of finding the particle).

This is a Bloch sphere: the North Pole is |0⟩, the South Pole is |1⟩, every other point is a superposition. Tilt the arrow, then press Measure many times and compare the counts with the predicted odds.

Launch a wave packet at the barrier. Make the barrier thinner or lower and watch more of the wave leak through.

Silver atoms fly through an uneven magnet. Classical magnets pointing every which way would smear into a line. Switch to quantum and see what nature really does.

Alice and Bob each receive one particle of an entangled pair. Measure many pairs. Each side alone is 50/50 random — but compare them and they always agree.

Pump energy into the atoms, then watch one stray photon start a chain reaction of identical twins bouncing between the mirrors.

Apply gates to the qubit. X flips it (like NOT). H puts |0⟩ into an equal superposition. Z flips its phase — invisible to measurement alone, but vital for interference. Try H, then H again!