Phase and interference
Make an invisible phase difference visible through interference.
Back to learning pathPhase, bases, and gate orderWhy this experiment matters
What you will do
Learn why amplitudes—not ordinary probabilities—can reinforce or cancel one another.
- 01
Split the state into two paths with H.
- 02
Shift the phase of one path.
- 03
Recombine the paths and measure the interference.
04 · PREDICT
Predict before you measure
Choose one answer to unlock the measurement.
INTERACTIVE
Interactive model
Move the control, then run a measurement. This is a teaching simulation—not hardware output.
Make a prediction, then run the measurement to reveal the expected and sampled results.
Measurement results
What the result shows
Aligned waves reinforce; opposite waves cancel. The phase becomes visible only after recombination.
GUIDED VIDEO
Watch the experiment
Follow the experiment with English narration and English subtitles.
Learn why amplitudes—not ordinary probabilities—can reinforce or cancel one another.
Full transcript5 · 1:00
- 01Overview
Learn why amplitudes—not ordinary probabilities—can reinforce or cancel one another.
- 02Experiment steps 1
Split the state into two paths with H.
- 03Experiment steps 2
Shift the phase of one path.
- 04Experiment steps 3
Recombine the paths and measure the interference.
- 05What to observe
Aligned waves reinforce; opposite waves cancel. The phase becomes visible only after recombination.
06 · CHECK
Check what you learned
Make a prediction, then run the measurement to reveal the expected and sampled results.