Double-Slit Quantum Interference

Parameters

Slit separation d2.0 Slit width a0.4 Wavelength λ1.0 Particles/frame10

Observables

Particles detected0

First minimum at—

Theory

Each particle passes through both slits as a probability amplitude wave, then lands as a definite point. The probability distribution is:

P(y) = sinc²(πay/λL) · cos²(πdy/λL)

The double-slit experiment demonstrates wave-particle duality: each particle lands randomly, but the ensemble builds up a perfect interference pattern.