Recent content by Sophocles

Thank you very much DrDu. After all, I finally got it!

Ok. So if I get it correctly, there are k vectors who belong to the reciprocal lattice, having periodicity the same as the real lattice (and the ones responsible for diffraction phenomena) and then there is K space for all the rest of the waves that can travel through the medium?

Hey guys, I just realized that there is a gap somewhere in my understanding of K vectors and reciprocal space. My question is how can we talk about K vectors "living" in the first Brillouin Zone, when these vectors cannot be expressed on the vector form of reciprocal space ( r*=ha*kb*+lc* ...

hilbert2 I thank you very very much! The problem itself is based on conceptual understanding so I guess we should not really care whether operator A has physical meaning or not. Again, thank you very much!

Ok I see your point! My concern now is whether operator A is a fictional-theoretical operator for the sake of the problem or must be a real one. Must it be self-adjoint? What is the characterization of operator A?

Hello guys, Homework Statement the problem goes as follows: "Which measurement should you do on a statistical ensemble of qubits in order to distinguish between the pure state |Ψ>= cos(θ)|0> + sin(θ)|1> and the mixed state ρ=cos^2(θ)|0><0| + sin^2(θ)|1><1| " Homework Equations I am not...