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Quantum Double-Slit Interference
Parameters
Wavelength λ:
500
nm
Slit Separation d:
80
px
Slit Width a:
20
px
Screen Distance L:
300
px
Wave
Photons
Which-Path
I(θ) = I₀ · sinc²(β) · cos²(δ)
β = πa·sin(θ)/λ, δ = πd·sin(θ)/λ
Wave mode:
full interference pattern.
Photons:
individual particles gradually build the pattern.
Which-path:
measuring which slit destroys coherence — no fringes.