Quantum Observer & Double-Slit Lab

p5.js Optics Engine
OPTICAL BENCH V3.4 (LIVE PHOTON FLUX) FPS: --
Laser & Emitter
Photon Flux Rate 100 /s
Laser Wavelength 532 nm
Mask & Slit Geometry
Slit Configuration 2 Slits
Slit Separation (d) 40 µm
Quantum Measurement
Which-Way Detector OFF
Delayed-Choice Eraser OFF
Physics Telemetry
Observed State WAVE INTERFERENCE
Path Information (D) 0.00 (None)
Fringe Visibility (V) 1.00 (Max)
Accumulated Hits 0
Coherent Superposition
Photons pass through both slits as a continuous probability wave, producing spatial interference fringes on the screen.

The Quantum Observer Effect

In quantum physics, measuring which slit a photon passes through collapses its wave function. When path information is known (D=1), interference disappears and yields two distinct classical particle bands.


In a Delayed-Choice Quantum Eraser setup, if path information is destroyed before detection, wave interference is restored even after the photon has traversed the slits!

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