OPTICAL BENCH & DUAL-BEAM OSCILLOSCOPE (2D WAVEPACKET PROPAGATION)
● REALTIME SIMULATION ACTIVE
0.0 MHz
0.85
5.0 mm
12.0 ns
QUANTUM TELEMETRY
Atomic Dwell Time (Δt)
-3.20 ps
Pulse Peak Shift (Δt_peak)
-0.040 ns
Excited State |e⟩ Integral
-0.150
✓ Causality Preserved: True
Anomalous dispersion creates forward pulse peak reshaping. Signal front velocity never exceeds c.
Anomalous dispersion creates forward pulse peak reshaping. Signal front velocity never exceeds c.
PHYSICS CONTEXT
In University of Toronto quantum optics experiments, photons passing through an atomic gas cloud near resonance undergo anomalous dispersion ($\frac{dn}{d\omega} < 0$).
The pulse peak leaves the vapor cell before the reference peak arrives. The effective time atoms spend in the excited state $|e\rangle$ is mathematically negative during group delay measurement, demonstrating pulse envelope reshaping without superluminal signal transfer.