## Double slit experiment
Light source behind wall with two narrow closely spaced slits.
Photosensitive plate on other side
![[Pasted image 20260728152302.png]]

Light waves overlap and interfere with each other.
Same amplitude = reinforcement
Different amplitude = cancel each other out

With single photons the same happens!
Photons are in superposition between two paths
Possibilities interfere with each other


## What is a quantum computer?
Classical Bits = 0 or 1
Quantum Computer uses qubits = superposition between 0 and 1
-> Variables that have all possible values at the same time!

### Quantum parallelism
Quantum computers apply operations to all possible input value at the same time
After a quantum computer has calculated a superposition of all possible values
you measure the result and the superposition collapses to a single random f(x)