Hello Quentin,
1) Yes, X is the Pauli X matrix = [0,1;1,0]
2) The Euler identity is similar to the one you mentioned(e^{i theta} = cos theta + i sin theta). The Euler identity for matrices that you need here is a generalization of the identity you proved in Exercise 2 of homework 4.
Best,
Dina
1) Yes, X is the Pauli X matrix = [0,1;1,0]
2) The Euler identity is similar to the one you mentioned(e^{i theta} = cos theta + i sin theta). The Euler identity for matrices that you need here is a generalization of the identity you proved in Exercise 2 of homework 4.
Best,
Dina
