Thanks to a 1927 discovery, thousands of scientists and students have repeated one and the same simple experiment by shining a laser through a hole that gradually becomes smaller. Logically, the visible laser point on the projection screen shrinks as the hole contracts. But when the hole becomes narrow enough, the laser point suddenly widens and expands across the screen until the hole closes.
This is the clearest proof of the quintessence of quantum physics – the Heisenberg uncertainty principle, which states: The more precisely we define one of a pair of properties in a quantum system, the more uncertain the other property becomes. In this case, the more precisely we define the position of the laser photons by making the hole smaller, the more uncertain their momentum becomes.
The 10 weirdest quantum physics facts
1. Wave function collapse
2. Heisenberg uncertainty principle
3. Meissner effect
5. Quantum tunneling
6. Quantum entanglement
7. Quantum Zeno effect
8. Delayed choice quantum eraser
9. Quantum superposition
10. Quantum Cheshire Cat
The Phase. Shattering the Illusion of Reality
by Michael Raduga