> How can something be an axiom and at the same time has a mathematical derivation well understood from Quantum Mechanics See my notes, it's not an axiom, just

> How can something be an axiom and at the same time has a mathematical derivation well understood from Quantum Mechanics See my notes, it's not an axiom, just take it for granted for the explanation to work. You can derive it from experiments like squeezing light, or you can derive it from other things as you mentioned.