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ObsidianVault/SS2026/Quantum Computing/19. Quantum Complexity/Quantum Complexity.md
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We start with the common class NP (Non-deterministic polynomial time)
![[Pasted image 20260806202511.png]]
*Some details omitted
![[Pasted image 20260806202558.png]]
Question: can quantum computers solve SAT in polynomial time? (and by that, all problems in NP?)
## Oracle lower bound
![[Pasted image 20260806202735.png]]
![[Pasted image 20260806202805.png]]
![[Pasted image 20260806202815.png]]
![[Pasted image 20260806202822.png]]![[Pasted image 20260806202829.png]]
## Quantum Merlin Arthur
Is there a "quantum NP"?
We define the class QMA (Quantum Merlin Arthur):
![[Pasted image 20260806203005.png]]
Example of a QMA Problem: Local Hamiltonian Problem
![[Pasted image 20260806203055.png]]