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diff --git a/SS2026/Quantum Computing/6. Composite Systems/Composite Systems.md b/SS2026/Quantum Computing/6. Composite Systems/Composite Systems.md
index 19f7a30..784752e 100644
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+++ b/SS2026/Quantum Computing/6. Composite Systems/Composite Systems.md	
@@ -12,3 +12,19 @@ Example:
 
 ![[Pasted image 20260729215837.png]]
 
+So to apply S to A and T to B we apply SxT to AB.
+
+If the distribution of a probabilistic system can be written as a composite A and B are independent
+If we cannot they are depended on each other
+
+If the quantum state of a system AB can be written as a tensor product they are independent
+If we cannot the quantum states depend on each other, we call this entangled~
+
+![[Pasted image 20260729220918.png]]
+
+
+## Measuring composite systems
+
+We can compose two separate measurements similarly to how we applied the tensor product.
+
+