Dotzero

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visits member for 1 year, 6 months
seen Sep 25 '12 at 21:43

Sep
25
asked A physical quantity that is a real combination and commutability
Sep
25
awarded  Scholar
Sep
25
accepted Matrix representing the quantity - why can some matrices not be physical quantity?
Sep
25
comment Matrix representing the quantity - why can some matrices not be physical quantity?
Question: But the book says that because $\frac{5}{3}\sigma_1$ and $\frac{4}{3}\sigma_2$ represents real quantities that cannot have definite values together, matrix $A$ cannot be a physical quantity.. I do get that these two matrices cannot have definite values simultaneously, but then, following the book's explanation, how can any combination of (Pauli or maybe non-Pauli) matrices be used to represent physical quantity? Am I seriously mistaken?
Sep
25
awarded  Student
Sep
25
comment Matrix representing the quantity - why can some matrices not be physical quantity?
any comment....?
Sep
25
asked Matrix representing the quantity - why can some matrices not be physical quantity?