This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: i times a Hermitian operator. (c) With what restriction on the number is 1 + i- - n 1-i- - n , (where- n * =- n ,- n - n = 1) , a unitary operator? Write this in the form of part (a) and in the form of part (b) .  Find the value of Tr ( 1 + ( x + y ) / 2 2 1 + (- x + y ) / 2 2 ) . What physical meaning can you give to this number? 1  A spin-1/2 particle interacts with a magnetic eld- B = B z through the Pauli interaction H = - - B where is the magnetic moment and- = ( x , y , z ) are the Pauli spin matrices. At t = 0 a measurement determines that the spin is pointing along the positive x-axis . What is the probability that it will be pointing along the negative y-axis at a later time t ? 2...
View Full Document
- Spring '09