vault backup: 2026-07-29 11:08:22

SS2026/Quantum Computing/1. Introduction/Introduction to Quantum physics.md

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+## 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)