Quantum Frequency-Division Multiplexer

Quantum networks increasingly carry many frequency-bin-encoded photon channels down a single optical fiber, exactly the way classical DWDM telecom links do — this simulator shows the whole round trip in 3D. Photons from each channel converge into one shared fiber (the multiplexer), then hit a diffraction grating at the far end that disperses them back into separate angles and separate detectors (the demultiplexer), following the real grating equation sinθ = λ/d. Tune the channel count, the frequency spacing between channels, and the grating's groove density to watch the angular separation between channels shrink or grow — push the spacing too low relative to the grating's resolving power and photons start crossing into the wrong detector, tracked live as crosstalk and routing fidelity.