- #1
Alex Cros
- 28
- 1
Upon reading Landau QM, the Principle of superposition of states, I got confused. It states (and i quote):
"Suppose that, in a state with wave function Ψ1(q), some measurement leads with certainty to a definite result 1, while in a state with Ψ2(q) it leads to a different result 2. Then it is assumed that every linear combination of Ψ1(q) and Ψ2(q) gives a state in which that measurement leads to either result 1 or result 2."
Cool I said, this implies that Ψ1,2(q) = Ψ1(q) +Ψ2(q) no?
Well I carried on reading of a system composed of two well known parts and found:
"Ψ1,2(q) =Ψ1(q)Ψ2(q)"
Be gentle with the explanation please!
"Suppose that, in a state with wave function Ψ1(q), some measurement leads with certainty to a definite result 1, while in a state with Ψ2(q) it leads to a different result 2. Then it is assumed that every linear combination of Ψ1(q) and Ψ2(q) gives a state in which that measurement leads to either result 1 or result 2."
Cool I said, this implies that Ψ1,2(q) = Ψ1(q) +Ψ2(q) no?
Well I carried on reading of a system composed of two well known parts and found:
"Ψ1,2(q) =Ψ1(q)Ψ2(q)"
Be gentle with the explanation please!