Search results with tag "Density matrices"

Chapter 9 Density Matrices - univie.ac.at

164 CHAPTER 9. DENSITY MATRICES Example: Density matrix for spin 1 2 Generally, this will be a 2 2 matrix that can be written as linear combination of the identity 1 and the Pauli matrices ˙ x;˙ y and ˙ z, as ˆ= 1 2 (1 + ~a~˙) : (9.25) The coe cient ~ais named the Bloch vector and can be calculated as the expectation value of the Pauli ...

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